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Dew Point Meter


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The Extech RH600 accurately measures and datalogs dew point levels in compressed air systems. This high-precision meter can help manufacturing professionals protect product quality while avoiding damaged pneumatic equipment, corrosion, and problems in cylinder and valve systems. Featuring a color graphical display, the RH600 provides clear, stable readings, allowing you to measure dew point temperature down to -50°C (-58°F) in max ambient pressure of 20 bar. Set high/low audible and visible alarms for temperature, relative humidity, and dew point thresholds. You can also easily log and transfer recorded data to a PC in CSV format to create inspection reports fast.

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  • Take reliable readings

    Probe sensor dries quickly after contact with moisture using the sensor purge/purification feature

  • Easily log data

    Monitor dew point over time using the datalogging feature, and record up to 32,000 data sets

  • Transfer data to your computer

    Download recorded data to your computer in CSV format using the included USB cable

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General Specifications
Dew Point
Range: -40°C to 30°C (-40°F to 86°F), Basic Accuracy: ±3.6°F (±2°C)
Range: -50°C to -40°C (-58°F to -40°F), Basic Accuracy: ±4.5°F (±2.5°)
Max Resolution: 0.01°
Dimensions & Weight
192 mm × 77 mm × 40 mm (7.5 in × 3.0 in × 1.6 in), 598 g (21.1 oz)
Relative Humidity
Range: 15 to 100% RH, Basic Accuracy: ±2% RH + 3% of reading
Range: 5 to 15% RH, Basic Accuracy: ±1% RH + 5% of reading
Range: 0 to 5% RH, Basic Accuracy: ±0.025% RH +17.5% of reading
Max Resolution: .01% RH
Response Time
At flow rate 0.2 m/s, 1 bar pressure, 63% RH [90% RH]
0°C to 40°C Td (32°F to -40°F Td): 20 s [120 s]
40°C to 0°C Td (-40°F to 32°F Td): 10 s [20 s]
Range: -10℃ to 60℃ (14℉ to 140℉)
Max Resolution: 0.01°
Basic Accuracy: ±0.3℃ (±0.54°F)
Water Concentration
Range: 40 to 20,000 ppm
Max Resolution: 1
Basic Accuracy: ±(7.3 ppm + 8.3% of rdg)
Additional Details
Data Logging
32,000 data sets with time stamps
Operating Conditions
-10°C to 60°C (14°F to 140°F), Pressure: 0 to 20 bar
Accuracy at environment temperature: 16°C to 25°C (60.8°F to 77°F)
3.7 V rechargeable Li-ion battery (included)
Related Documents
Export Restrictions

Export Restrictions

The information contained in this page pertains to products that may be subject to the International Traffic in Arms Regulations (ITAR) (22 C.F.R. Sections 120-130) or the Export Administration Regulations (EAR) (15 C.F.R. Sections 730-774) depending upon specifications for the final product; jurisdiction and classification will be provided upon request.