These instruments are designed to monitor indoor air quality (IAQ) and combustion gas machines during installation and maintenance operations by measuring concentrations of gases and other substances in the air. [ ![Calibration benches](/sites/default/files/styles/event_thumb_max_200w/public/images/calibration%20benches.jpg.webp?itok=BWsFczvb) ](/en-INT/measuring-instruments/calibration-benches) [Calibration benches ](/en-INT/measuring-instruments/calibration-benches) [ View all ](/en-INT/measuring-instruments/calibration-benches) [ ![Data loggers](/sites/default/files/styles/event_thumb_max_200w/public/images/compo-couv-kistock-sonde-web.png.webp?itok=4GnIPTyt) ](/en-INT/data-loggers) [Data loggers ](/en-INT/data-loggers)[Autonomous data loggers](/en-INT/measuring-instruments/data-loggers/autonomous-data-loggers) [Probes](/en-INT/measuring-instruments/data-loggers/probes) [Accessories](/en-INT/measuring-instruments/data-loggers/accessories) [Software & Apps](/en-INT/measuring-instruments/data-loggers/software) [ View all ](/en-INT/data-loggers) [ ![Manometers](/sites/default/files/styles/event_thumb_max_200w/public/images/manometers.jpg.webp?itok=Xlw3IW4x) ](/en-INT/measuring-instruments/manometers) [Manometers ](/en-INT/measuring-instruments/manometers)[Liquid column manometers](/en-INT/measuring-instruments/manometers/liquid-column-manometers) [Manometers with needle](/en-INT/measuring-instruments/manometers/manometers-needle) [Pressure switches](/en-INT/measuring-instruments/manometers/pressure-switches) [Accessories](/en-INT/measuring-instruments/manometers/accessories) [ View all ](/en-INT/measuring-instruments/manometers) [ ![Transmitters](/sites/default/files/styles/event_thumb_max_200w/public/images/transmitters.jpg.webp?itok=oVZLYmRl) ](/en-INT/measuring-instruments/transmitters) [Transmitters ](/en-INT/measuring-instruments/transmitters)[Pressure transmitters](/en-INT/measuring-instruments/transmitters/pressure-transmitters) [Multi-parameters transmitters](/en-INT/measuring-instruments/transmitters/multi-parameter-transmitters) [Humidity transmitters](/en-INT/measuring-instruments/transmitters/humidity-transmitters) [Air velocity transmitters](/en-INT/measuring-instruments/transmitters/air-velocity-transmitters) [Temperature transmitters](/en-INT/measuring-instruments/transmitters/temperature-transmitters) [CO2 transmitters](/en-INT/measuring-instruments/transmitters/co2-transmitters) [CO transmitters](/en-INT/measuring-instruments/transmitters/co-transmitters) [Lux transmitters](/en-INT/measuring-instruments/transmitters/lux-transmitters) [Probes ](/en-INT/measuring-instruments/transmitters/probes) [Software & Apps](/en-INT/measuring-instruments/transmitters/software) [ View all ](/en-INT/measuring-instruments/transmitters) [ ![portable measuring instruments](/sites/default/files/styles/event_thumb_max_200w/public/images/portable%20measuring%20instruments.jpg.webp?itok=Wc8cOv9m) ](/en-INT/measuring-instruments/portable-instruments) [Portable instruments ](/en-INT/measuring-instruments/portable-instruments)[Multifunctions](/en-INT/measuring-instruments/portable-instruments/multifunctions) [Anemometers](/en-INT/measuring-instruments/portable-instruments/anemometers) [Micromanometers](/en-INT/measuring-instruments/portable-instruments/micromanometers) [Air flow meters](/en-INT/measuring-instruments/portable-instruments/airflow-meters) [Thermometers](/en-INT/measuring-instruments/portable-instruments/thermometers) [Hygrometers](/en-INT/measuring-instruments/portable-instruments/hygrometers) [Air quality measurement](/en-INT/measuring-instruments/portable-instruments/air-quality-measurement) [Lux meters](/en-INT/measuring-instruments/portable-instruments/lux-meters) [Tachometers](/en-INT/measuring-instruments/portable-instruments/tachometers) [Pin moisture meters](/en-INT/measuring-instruments/portable-instruments/pin-moisture-meters) [Probes ](/en-INT/measuring-instruments/portable-instruments/probes) [Refrigerant leak detectors](/en-INT/measuring-instruments/portable-instruments/refrigerant-leak-detector) [Accessories](/en-INT/measuring-instruments/portable-instruments/accessories) [Software & Apps](/en-INT/measuring-instruments/portable-instruments/software) [ View all ](/en-INT/measuring-instruments/portable-instruments) [ ![combustion measuring instruments](/sites/default/files/styles/event_thumb_max_200w/public/images/130-COMPO-LEFT_web_1.png.webp?itok=tdyjcilL) ](/en-INT/measuring-instruments/combustion) [Combustion ](/en-INT/measuring-instruments/combustion)[Flue gas analyzers](/en-INT/measuring-instruments/combustion/flue-gas-analyzers) [Gas detectors](/en-INT/measuring-instruments/portable-instruments/gas-detectors) [Accessories](/en-INT/measuring-instruments/combustion/accessories) [Software & Apps](/en-INT/measuring-instruments/combustion/software) [ View all ](/en-INT/measuring-instruments/combustion) [ ![Digital refrigeration gauges](/sites/default/files/styles/event_thumb_max_200w/public/images/digital%20refrigerant%20gauges.jpg.webp?itok=nyiGc8mX) ](/en-INT/digital-refrigerant-gauges) [Digital refrigeration gauges ](/en-INT/digital-refrigerant-gauges)[Wireless digital manifolds](/en-INT/measuring-instruments/digital-refrigerant-gauges/wireless-digital-manifolds) [Temperature probes](/en-INT/measuring-instruments/digital-refrigerant-gauges/probes) [Accessories](/en-INT/measuring-instruments/digital-refrigerant-gauges/accessories) [Software & Apps](/en-INT/measuring-instruments/digital-refrigerant-gauges/software) [ View all ](/en-INT/digital-refrigerant-gauges) [ ![Autonomous temperature probes](/sites/default/files/styles/event_thumb_max_200w/public/images/temperature%20probes.jpg.webp?itok=QUzzglmi) ](/en-INT/autonomous-temperature-probes) [Autonomous temperature probes ](/en-INT/autonomous-temperature-probes)[Resistive](/en-INT/measuring-instruments/autonomous-temperature-probes/resistive) [Thermocouples](/en-INT/measuring-instruments/autonomous-temperature-probes/thermocouple) [Converters](/en-INT/measuring-instruments/autonomous-temperature-probes/converters) [Accessories](/en-INT/measuring-instruments/autonomous-temperature-probes/accessories) [ View all ](/en-INT/autonomous-temperature-probes)