Zum Hauptinhalt springen
Closing Force Measuring Device BIA Class 2 for bus doors
US$ 895.00
ex. VAT, ex. delivery costs
ISO Calibration

The original BIA class 2 is a mechanical closing force measuring device for bus doors. The elaborate design combines precision with practical robustness and ensures accurate measured values even after years of use in harsh environments.

  • Measuring range and sensor must be selected!
  • Stiffness: 10 N/mm or 25 N/mm depends on the sensor selection
  • Accuracy: +/- 10 N or 5% of reading
  • Measuring principle: slave pointer
  • Precise measurements
  • Easy to use
  • Standards and directives: 2001 85 EC
  • incl. ISO calibration certificate

Condition Monitoring Sound Level Meter PCE-SLT-ICA incl. ISO Calibration Cert.
US$ 891.00
ex. VAT, ex. delivery costs
ISO Calibration
The Condition Monitoring Sound Level Meter consists of a measuring microphone with handle and a wall bracket with 1.5 m / 4.9 ft cable, a noise transmitter and a digital display. The main field of application of the noise measuring device is the continuous noise measurement and noise monitoring of factory buildings, production areas and major events such as night clubs, music festivals or karting tracks.

  • Range : 30 … 130dB (A)
  • Resolution: 0.1dB
  • Accuracy: ± 1.5dB
  • Alarm relay: 5A / 240VAC
  • Supply: 250V / 50Hz
  • Handle and wall mount
  • Analogue output signal
  • Incl. ISO calibration certificate
Decibel Meter PCE-SLT-ICA incl. ISO Calibration Certificate
US$ 891.00
ex. VAT, ex. delivery costs
ISO Calibration
The decibel meter consists of a measuring microphone with handle and a wall bracket with 1.5 m / 4.9 ft cable, a noise transmitter and a digital display. The main field of application of the noise measuring device is the continuous noise measurement and noise monitoring of factory buildings, production areas and major events such as night clubs, folk festivals or karting tracks.

  • Range : 30 … 130dB (A)
  • Resolution: 0.1dB
  • Accuracy: ± 1.5dB
  • Alarm relay: 5A / 240VAC
  • Supply: 250V / 50Hz
  • Handle and wall mount
  • Analogue output signal
  • Incl. ISO calibration certificate
Environmental Meter PCE SLT-ICA incl. ISO Calibration Certificate
US$ 891.00
ex. VAT, ex. delivery costs
ISO Calibration
The environmental meter consists of a measuring microphone with handle and a wall bracket with 1.5 m / 4.9 ft cable, a noise transmitter and a digital display. The main field of application of the noise measuring device is the continuous noise measurement and noise monitoring of factory buildings, production areas and major events such as night clubs, folk festivals or karting tracks.

  • Range : 30 … 130dB (A)
  • Resolution: 0.1dB
  • Accuracy: ± 1.5dB
  • Alarm relay: 5A / 240VAC
  • Supply: 250V / 50Hz
  • Handle and wall mount
  • Analogue output signal
  • Incl. ISO calibration certificate
Environmental Tester PCE SLT-ICA incl. ISO Calibration Certificate
US$ 891.00
ex. VAT, ex. delivery costs
ISO Calibration
The environmental tester consists of a measuring microphone with handle and a wall bracket with 1.5 m / 4.9 ft cable, a noise transmitter and a digital display. The main field of application of the noise measuring device is the continuous noise measurement and noise monitoring of factory buildings, production areas and major events such as night clubs, folk festivals or karting tracks.

  • Range : 30 … 130dB (A)
  • Resolution: 0.1dB
  • Accuracy: ± 1.5dB
  • Alarm relay: 5A / 240VAC
  • Supply: 250V / 50Hz
  • Handle and wall mount
  • Analogue output signal
  • Incl. ISO calibration certificate
Noise Meter / Sound Meter PCE-SLT-ICA incl. ISO Calibration Certificate
US$ 891.00
ex. VAT, ex. delivery costs
ISO Calibration
The noise meter consists of a measuring microphone with handle and a wall bracket with 1.5 m / 4.9 ft cable, a noise transmitter and a digital display. The main field of application of the noise measuring device is the continuous noise measurement and noise monitoring of factory buildings, production areas and major events such as night clubs, folk festivals or karting tracks.

  • Range : 30 … 130dB (A)
  • Resolution: 0.1dB
  • Accuracy: ± 1.5dB
  • Alarm relay: 5A / 240VAC
  • Supply: 250V / 50Hz
  • Handle and wall mount
  • Analogue output signal
  • Incl. ISO calibration certificate
Sound Level Meter PCE-SLT-ICA incl. ISO Calibration Certificate
US$ 891.00
ex. VAT, ex. delivery costs
ISO Calibration
The sound level meter meter consists of a measuring microphone with handle and a wall bracket with 1.5 m / 4.9 ft cable, a noise transmitter and a digital display. The main field of application of the noise measuring device is the continuous noise measurement and noise monitoring of factory buildings, production areas and major events such as night clubs, music festivals or karting tracks.

  • Range : 30 … 130dB (A)
  • Resolution: 0.1dB
  • Accuracy: ± 1.5dB
  • Alarm relay: 5A / 240VAC
  • Supply: 250V / 50Hz
  • Handle and wall mount
  • Analogue output signal
  • Incl. ISO calibration certificate
Sound Sensor PCE SLT-ICA incl. ISO Calibration Certificate
US$ 891.00
ex. VAT, ex. delivery costs
ISO Calibration
The sound sensor consists of a measuring microphone with handle and a wall bracket with 1.5 m / 4.9 ft cable, a noise transmitter and a digital display. The main field of application of the noise measuring device is the continuous noise measurement and noise monitoring of factory buildings, production areas and major events such as night clubs, folk festivals or karting tracks.

  • Range : 30 … 130dB (A)
  • Resolution: 0.1dB
  • Accuracy: ± 1.5dB
  • Alarm relay: 5A / 240VAC
  • Supply: 250V / 50Hz
  • Handle and wall mount
  • Analogue output signal
  • Incl. ISO calibration certificate
SPL Meter PCE SLT-ICA incl. ISO Calibration Certificate
US$ 891.00
ex. VAT, ex. delivery costs
ISO Calibration
The SPL meter consists of a measuring microphone with handle and a wall bracket with 1.5 m / 4.9 ft cable, a noise transmitter and a digital display. The main field of application of the noise measuring device is the continuous noise measurement and noise monitoring of factory buildings, production areas and major events such as night clubs, folk festivals or karting tracks.

  • Range : 30 … 130dB (A)
  • Resolution: 0.1dB
  • Accuracy: ± 1.5dB
  • Alarm relay: 5A / 240VAC
  • Supply: 250V / 50Hz
  • Handle and wall mount
  • Analogue output signal
  • Incl. ISO calibration certificate
Gloss Meter PCE-RM 100
US$ 888.00
ex. VAT, ex. delivery costs
The gloss or opacity meter PCE-RM 100 is used to measure the reflection properties of surfaces related to opacity. The gloss meter PCE-RM 100 is used in tinting glass, film quality, opacity of paper, light shading and the hiding power of various paints, inks, and coatings. 

  • Measuring range: 0 … 100 (0 is transparent and 100 is fully opaque)
  • Optical measurement angle: 45º degree angle
  • Measuring accuracy: ± 1
  • Resolution: 0.1
  • Battery operation
  • Interface and software
NDT Tester - Opacity Meter PCE-RM 100
US$ 888.00
ex. VAT, ex. delivery costs
The NDT tester - opacity meter PCE-RM 100 is used to measure the reflection properties of surfaces. The NDT tester - opacity meter PCE-RM 100 is used in tinting glass, film quality, opacity of paper, light shading and the hiding power of various paints, inks, and coatings. 

  • Measuring range: 0 … 100 (0 is transparent and 100 is fully opaque)
  • Optical measurement angle: 45º degree angle
  • Measuring accuracy: ± 1
  • Resolution: 0.1
  • Battery operation
  • Interface and software
Paint Gloss Tester PCE-RM 100
US$ 888.00
ex. VAT, ex. delivery costs
The gloss or opacity meter PCE-RM 100 is used to measure the reflection properties of surfaces related to opacity. The gloss meter PCE-RM 100 is used in tinting glass, film quality, opacity of paper, light shading and the hiding power of various paints, inks, and coatings. 

  • Measuring range: 0 … 100 (0 is transparent and 100 is fully opaque)
  • Optical measurement angle: 45º degree angle
  • Measuring accuracy: ± 1
  • Resolution: 0.1
  • Battery operation
  • Interface and software
Surface Testing - Opacity Meter PCE-RM 100
US$ 888.00
ex. VAT, ex. delivery costs
The surface testing - gloss meter PCE-RM 100 is used to measure the reflection properties of surfaces. The surface testing - gloss meter PCE-RM 100 is used in tinting glass, film quality, opacity of paper, light shading and the hiding power of various paints, inks, and coatings. 

  • Measuring range: 0 … 100 (0 is transparent and 100 is fully opaque)
  • Optical measurement angle: 45º degree angle
  • Measuring accuracy: ± 1
  • Resolution: 0.1
  • Battery operation
  • Interface and software
Test stand STAND-PCE-DDx10
US$ 888.00
ex. VAT, ex. delivery costs

Test stand for PCE-DDx series durometers. The test stand can be used to mount the durometers. The test stand allows precise positioning of the probe on the test object. 

  • Test stand for mounting of the PCE-DDx durometers

Environmental Meter PCE-PH 228LAB-ME3
US$ 885.00
ex. VAT, ex. delivery costs
The Environmental Meter stands for precision, user-friendliness and GLP compliance. With a high-resolution LC display, the Environmental Meter provides a clear and concise presentation of the measured values. GLP compliance is guaranteed by automatic data recording and traceable documentation. It is possible to measure pH or redox values and temperature with external sensors.

  • measurement range -2 ... +20 pH (meter)
  • measurement range 0 ... 14 pH (electrode)
  • pH electrode with 3 mm microtip
  • high accuracy ±0.002 pH + 2 digits
  • GLP data management
  • simple 2, 3, 4 and 5-point calibration
  • calibration reminder
  • praphic display of measurement progress
  • data logger
  • application: beer, blood, dairy products
  • for food industry, agriculture, laboratory
Environmental Tester PCE-PH 228LAB-ME3
US$ 885.00
ex. VAT, ex. delivery costs
The Environmental Tester stands for precision, user-friendliness and GLP compliance. With a high-resolution LC display, the Environmental Tester provides a clear and concise presentation of the measured values. GLP compliance is guaranteed by automatic data recording and traceable documentation. It is possible to measure pH or redox values and temperature with external sensors.

  • measurement range -2 ... +20 pH (meter)
  • measurement range 0 ... 14 pH (electrode)
  • pH electrode with 3 mm microtip
  • high accuracy ±0.002 pH + 2 digits
  • GLP data management
  • simple 2, 3, 4 and 5-point calibration
  • calibration reminder
  • praphic display of measurement progress
  • data logger
  • application: beer, blood, dairy products
  • for food industry, agriculture, laboratory
pH Meter / pH Tester PCE-PH 228LAB-ME3
US$ 885.00
ex. VAT, ex. delivery costs
The pH Meter / pH Tester stands for precision, user-friendliness and GLP compliance. With a high-resolution LC display, the pH Meter / pH Tester provides a clear and concise presentation of the measured values. GLP compliance is guaranteed by automatic data recording and traceable documentation. It is possible to measure pH or redox values and temperature with external sensors.

  • measurement range -2 ... +20 pH (meter)
  • measurement range 0 ... 14 pH (electrode)
  • pH electrode with 3 mm microtip
  • high accuracy ±0.002 pH + 2 digits
  • GLP data management
  • simple 2, 3, 4 and 5-point calibration
  • calibration reminder
  • praphic display of measurement progress
  • data logger
  • application: beer, blood, dairy products
  • for food industry, agriculture, laboratory
Water Analysis Meter PCE-PH 228LAB-ME3
US$ 885.00
ex. VAT, ex. delivery costs
The Water Analysis Meter stands for precision, user-friendliness and GLP compliance. With a high-resolution LC display, the Water Analysis Meter provides a clear and concise presentation of the measured values. GLP compliance is guaranteed by automatic data recording and traceable documentation.

  • measurement range -2 ... +20 pH (meter)
  • measurement range 0 ... 14 pH (electrode)
  • pH electrode with 3 mm microtip
  • high accuracy ±0.002 pH + 2 digits
  • GLP data management
  • simple 2, 3, 4 and 5-point calibration
  • calibration reminder
  • praphic display of measurement progress
  • data logger
  • application: beer, blood, dairy products
  • for food industry, agriculture, laboratory
Absolute Moisture Meter FMC
US$ 871.00
ex. VAT, ex. delivery costs

The Absolute Moisture Meter FMC can accurately measure absolute moisture in diverse building materials. To detect moisture, the test instrument has a connection for external sensors which can either be inserted into the building material or placed on it.


  • Measuring range: 5-99% wood / 0-99% building materials
  • Resolution: 0.1 % / Accuracy: ±0.3 %
  • Sensor not included
  • External probe
  • For wood, paper and building materials

Building Moisture Meter FMC
US$ 871.00
ex. VAT, ex. delivery costs

The building moisture meter can accurately measure absolute humidity in diverse building materials. To detect moisture, the building moisture meter has a connection for external sensors which can either be inserted into the building material or placed on it.


  • Measuring range: 5-99% wood / 0-99% building materials
  • Resolution: 0.1 %
  • Accuracy: ±0.3 %
  • Sensor not included
  • External probe
  • For wood, paper and building materials

Concrete Moisture Meter FMC
US$ 871.00
ex. VAT, ex. delivery costs

The Concrete Moisture Meter FMC can accurately measure absolute humidity in diverse building materials. To detect humidity, the Concrete Moisture Meter has a connection for external sensors which can either be inserted into the building material or placed on it.


  • Measuring range: 5-99% wood / 0-99% building materials
  • Resolution: 0.1 %
  • Accuracy: ±0.3 %
  • Sensor not included
  • External probe
  • For wood, paper and building materials

Moisture Analyzer for Building Materials FMC
US$ 871.00
ex. VAT, ex. delivery costs

The Moisture Analyzer FMC can accurately measure absolute humidity in diverse building materials. To detect moisture, the Moisture Analyzer has a connection for external sensors which can either be inserted into the building material or placed on it.


  • Measuring range: 5-99% wood / 0-99% building materials
  • Resolution: 0.1 %
  • Accuracy: ±0.3 %
  • Sensor not included
  • External probe
  • For wood, paper and building materials

Moisture Meter FMC
US$ 871.00
ex. VAT, ex. delivery costs

The Moisture Meter FMC can accurately measure absolute humidity in diverse building materials. To detect humidity, the Moisture Meter has a connection for external sensors which can either be inserted into the building material or placed on it.


  • Measuring range: 5-99% wood / 0-99% building materials
  • Resolution: 0.1 %
  • Accuracy: ±0.3 %
  • Sensor not included
  • External probe
  • For wood, paper and building materials

Timber Moisture Meter FMC
US$ 871.00
ex. VAT, ex. delivery costs

The Timber Moisture Meter FMC can accurately measure absolute humidity in diverse building materials. To detect humidity, the Timber Moisture Meter has a connection for external sensors which can either be inserted into the building material or placed on it.


  • Measuring range: 5-99% wood / 0-99% building materials
  • Resolution: 0.1 %
  • Accuracy: ±0.3 %
  • Sensor not included
  • External probe
  • For wood, paper and building materials

Wall Moisture Meter FMC
US$ 871.00
ex. VAT, ex. delivery costs

The Wall Moisture Meter FMC can accurately measure absolute humidity in diverse building materials. To detect humidity, the Wall Moisture Meter has a connection for external sensors which can either be inserted into the building material or placed on it.


  • Measuring range: 5-99% wood / 0-99% building materials
  • Resolution: 0.1 %
  • Accuracy: ±0.3 %
  • Sensor not included
  • External probe
  • For wood, paper and building materials

Wood Moisture Meter FMC
US$ 871.00
ex. VAT, ex. delivery costs

The Wood Moisture Meter FMC can accurately measure absolute humidity in diverse building materials. To detect humidity, the FMC Wood Moisture Meter has a connection for external sensors which can either be inserted into the building material or placed on it.


  • Measuring range:
    5-99% wood / 0-99% building materials
  • Resolution: 0.1 %
  • Accuracy: ±0.3 %
  • Sensor not included
  • External probe
  • For wood, paper and building materials

 

Durometer for Metals PCE-2500N
US$ 867.00
ex. VAT, ex. delivery costs

PCE-2500N is a portable handheld pen-sized digital material hardness tester, rebound hammer or durometer for use with metals. This high-accuracy hardness tester quickly and accurately measures the surface hardness of 10 common metal materials including steel, cast steel, alloy tool steel, stainless steel, cast iron, ductile iron, cast aluminum alloy, brass, bronze and copper.

  • Measuring principle: Leeb Rebound method
  • Displays measurements in Rockwell A, B or C (HRA, HRB or HRC), Brinell (HB), Vickers (HV), Shore (HS) or Leeb (HLD)
  • Measurement ranges: 170-960 HLD, 59.1-88 HRA, 3.5-101.7 HRB, 17.9-69.5 HRC, 19-683 HB, 80-1042 HV, 30.6-102.6 HS
  • Accuracy: ± 0.5%; Repeatability: ± 0.8%
  • Type D impact device

Hardness Tester for Metals PCE-2500N
US$ 867.00
ex. VAT, ex. delivery costs

PCE-2500N is a portable handheld pen-sized digital material hardness tester, rebound hammer or durometer for use with metals. This high-accuracy hardness tester quickly and accurately measures the surface hardness of 10 common metal materials including steel, cast steel, alloy tool steel, stainless steel, cast iron, ductile iron, cast aluminum alloy, brass, bronze and copper.

  • Measuring principle: Leeb Rebound method
  • Displays measurements in Rockwell A, B or C (HRA, HRB or HRC), Brinell (HB), Vickers (HV), Shore (HS) or Leeb (HLD)
  • Measurement ranges: 170-960 HLD, 59.1-88 HRA, 3.5-101.7 HRB, 17.9-69.5 HRC, 19-683 HB, 80-1042 HV, 30.6-102.6 HS
  • Accuracy: ± 0.5%; Repeatability: ± 0.8%
  • Type D impact device

Material Hardness Tester for Metals PCE-2500N
US$ 867.00
ex. VAT, ex. delivery costs

PCE-2500N is a portable handheld pen-sized digital material hardness tester, rebound hammer or durometer for use with metals. This high-accuracy hardness tester quickly and accurately measures the surface hardness of 10 common metal materials including steel, cast steel, alloy tool steel, stainless steel, cast iron, ductile iron, cast aluminum alloy, brass, bronze and copper.

  • Measuring principle: Leeb Rebound method
  • Displays measurements in Rockwell A, B or C (HRA, HRB or HRC), Brinell (HB), Vickers (HV), Shore (HS) or Leeb (HLD)
  • Measurement ranges: 170-960 HLD, 59.1-88 HRA, 3.5-101.7 HRB, 17.9-69.5 HRC, 19-683 HB, 80-1042 HV, 30.6-102.6 HS
  • Accuracy: ± 0.5%; Repeatability: ± 0.8%
  • Type D impact device

Metal Hardness Tester PCE-2500N
US$ 867.00
ex. VAT, ex. delivery costs

PCE-2500N is a portable handheld pen-sized digital material hardness tester, rebound hammer or durometer for use with metals. This high-accuracy hardness tester quickly and accurately measures the surface hardness of 10 common metal materials including steel, cast steel, alloy tool steel, stainless steel, cast iron, ductile iron, cast aluminum alloy, brass, bronze and copper.

  • Measuring principle: Leeb Rebound method
  • Displays measurements in Rockwell A, B or C (HRA, HRB or HRC), Brinell (HB), Vickers (HV), Shore (HS) or Leeb (HLD)
  • Measurement ranges: 170-960 HLD, 59.1-88 HRA, 3.5-101.7 HRB, 17.9-69.5 HRC, 19-683 HB, 80-1042 HV, 30.6-102.6 HS
  • Accuracy: ± 0.5%; Repeatability: ± 0.8%
  • Type D impact device

NDT Tester PCE-2500N
US$ 867.00
ex. VAT, ex. delivery costs

PCE-2500N is a portable handheld pen-sized digital material hardness tester, rebound hammer or durometer for use with metals. This high-accuracy hardness tester quickly and accurately measures the surface hardness of 10 common metal materials including steel, cast steel, alloy tool steel, stainless steel, cast iron, ductile iron, cast aluminum alloy, brass, bronze and copper.

  • Measuring principle: Leeb Rebound method
  • Displays measurements in Rockwell A, B or C (HRA, HRB or HRC), Brinell (HB), Vickers (HV), Shore (HS) or Leeb (HLD)
  • Measurement ranges: 170-960 HLD, 59.1-88 HRA, 3.5-101.7 HRB, 17.9-69.5 HRC, 19-683 HB, 80-1042 HV, 30.6-102.6 HS
  • Accuracy: ± 0.5%; Repeatability: ± 0.8%
  • Type D impact device

Clamp Meter PCE-PA 7200
US$ 866.00
ex. VAT, ex. delivery costs
Topseller
The clamp meter is a useful tool for the precise measurement of various electrical parameters. With a measuring range of up to 9999 kW for power and 0 to 1000 A for alternating current, it offers sufficient flexibility for various applications. The clamp meter offers a memory for 2000 measured values and data transfer to the software included in the scope of delivery.

  • AC voltage: 0 … 600 V
  • Resolution 0.1 V 
  • Accuracy ±1 % of Mw. ±5 digits
  • Alternating current: 0 … 1000 A
  • Resolution 0.1 A 
  • Accuracy 1.5 % v.Mw.
  • Active power
  • Power factor
  • Active energy
  • Frequency
  • Adjustable alarms
  • Memory and software
Clamp on Tester PCE-PA 7200
US$ 866.00
ex. VAT, ex. delivery costs
Topseller
The clamp on tester is a useful tool for the precise measurement of various electrical parameters. With a measuring range of up to 9999 kW for power and 0 to 1000 A for alternating current, it offers sufficient flexibility for various applications. The clamp on tester offers a memory for 2000 measured values and data transfer to the software included in the scope of delivery.

  • AC voltage: 0 … 600 V
  • Resolution 0.1 V 
  • Accuracy ±1 % of Mw. ±5 digits
  • Alternating current: 0 … 1000 A
  • Resolution 0.1 A 
  • Accuracy 1.5 % v.Mw.
  • Active power
  • Power factor
  • Active energy
  • Frequency
  • Adjustable alarms
  • Memory and software
Current Clamp PCE-PA 7200
US$ 866.00
ex. VAT, ex. delivery costs
Topseller
The current clamp is a useful tool for the precise measurement of various electrical parameters. With a measuring range of up to 9999 kW for power and 0 to 1000 A for alternating current, it offers sufficient flexibility for various applications. The current clamp offers a memory for 2000 measured values and data transfer to the software included in the scope of delivery.

  • AC voltage: 0 … 600 V
  • Resolution 0.1 V 
  • Accuracy ±1 % of Mw. ±5 digits
  • Alternating current: 0 … 1000 A
  • Resolution 0.1 A 
  • Accuracy 1.5 % v.Mw.
  • Active power
  • Power factor
  • Active energy
  • Frequency
  • Adjustable alarms
  • Memory and software
Electrical Tester PCE-PA 7200
US$ 866.00
ex. VAT, ex. delivery costs
Topseller
The electrical tester is a useful tool for the precise measurement of various electrical parameters. With a measuring range of up to 9999 kW for power and 0 to 1000 A for alternating current, it offers sufficient flexibility for various applications. The electrical tester offers a memory for 2000 measured values and data transfer to the software included in the scope of delivery.

  • AC voltage: 0 … 600 V
  • Resolution 0.1 V 
  • Accuracy ±1 % of Mw. ±5 digits
  • Alternating current: 0 … 1000 A
  • Resolution 0.1 A 
  • Accuracy 1.5 % v.Mw.
  • Active power
  • Power factor
  • Active energy
  • Frequency
  • Adjustable alarms
  • Memory and software
HVAC Meter PCE-PA 7200
US$ 866.00
ex. VAT, ex. delivery costs
Topseller
The HVAC Meter is a useful tool for the precise measurement of various electrical parameters. With a measuring range of up to 9999 kW for power and 0 to 1000 A for alternating current, it offers sufficient flexibility for various applications. The HVAC Meter offers a memory for 2000 measured values and data transfer to the software included in the scope of delivery.

  • AC voltage: 0 … 600 V
  • Resolution 0.1 V 
  • Accuracy ±1 % of Mw. ±5 digits
  • Alternating current: 0 … 1000 A
  • Resolution 0.1 A 
  • Accuracy 1.5 % v.Mw.
  • Active power
  • Power factor
  • Active energy
  • Frequency
  • Adjustable alarms
  • Memory and software