- Details
- Category: Humidity Meters & Hygrometers

The RHM15 is a miniature hydrothermometer monitor that measures and shows humidity and temperature at the same time. The RHM15 includes a built-in memory that stores maximum and minimum readings. The RHM15 has a low battery indicator and comes with a built-in stand, user manual, and an LR44 battery. Measures only in degrees Fahrenheit.
Relative Humidity | 10 to 99% |
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Relative Humidity Basic Accuracy | ±5% (25 to 75%) |
Relative Humidity Max Resolution | 1% |
Temperature (Air) | 14 to 140° F |
Temperature (Air) Basic Accuracy | ±2°F (14 to 122°F) |
Temperature (Air) Max Resolution | 1°F |
Certifications | CE |
Dimensions | 2 × 1.5 × 0.63" (50.8 × 38.1 × 16mm) |
Power | 1 × LR44/AG13 (1.5V) battery |
Warranty | 2 years |
Weight | 0.8 oz. (23g) |
- Details
- Category: Humidity Meters & Hygrometers

The Extech RH550 allows you to simultaneously datalog and monitor relative humidity, temperature, and computed dew point. It has live or user-selected recording time and configurable Min/Max alarm set points. The package includes a built-in stand for desktop use as well as a bracket for wall mounting. The RH550 also includes a field-replaceable probe that may be attached to the monitor or via a 6.5-foot (2-meter) wire. This recorder is useful in a variety of settings, including offices, conference rooms, labs, hospitals, cleanrooms, greenhouses, and food storage facilities.
Dew Point | -4 to 176°F (-20 to 80°C) |
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Dew Point Max Resolution | 0.1° |
Memory | 16 GB |
Relative Humidity | 10% to 95% |
Relative Humidity Basic Accuracy | ±2.5% |
Relative Humidity Max Resolution | 0.1% |
Sampling Rate | 1 sec to 24 hrs |
Temperature (Air) | 14 to 104°F (-10 to 40°C), -4 to 176°F (-20 to 80°C) |
Temperature (Air) Basic Accuracy | ±0.9°F (±0.5°C) |
Temperature (Air) Max Resolution | 0.1° |
Certifications | CE |
Dimensions | 7.8 × 4.6 × 1" (198 × 118 × 25.7 mm) |
Power | Internal rechargeable Lithium Polymer battery, universal AC adaptor with multi-plugs (US, EU, UK, AU) |
Warranty | 2 years |
Weight | 12.9 oz (365 g) |
- Details
- Category: Humidity Meters & Hygrometers

The Extech RH520B is a paperless chart recorder that displays %RH, temperature, or dew point in both digital and graphical formats, as well as date/time and min/max values. Use the free PC-based program to upload data to a computer and graph percent RH, temperature, dew point, wet bulb, and g/kg or GPP. Humidity and temperature alarm thresholds can be set using both audible and visual indicators. This recorder is perfect for monitoring temperature and humidity in storage facilities, greenhouses, laboratories, and other buildings.
Relative Humidity | 1 to 99% |
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Relative Humidity Basic Accuracy | ±3% |
Temperature (Air) | -22.0 to 140.0°F (-30.0 to 60.0°C) |
Temperature (Air) Basic Accuracy | ±1.8°F (±1°C) |
Certifications | CE |
Dimensions | 5 × 7.7 × 0.9" (129 × 195 × 22 mm) |
Power | 3 × AA (1.5V) batteries |
Warranty | 2 years |
Weight | 12.6oz (357 g) |
- Details
- Category: Humidity Meters & Hygrometers

Anyone whose job requires calculating humidity levels will appreciate the Extech Hygro-Psychrometer. This handheld instrument measures relative humidity in 30 seconds and also measures dew point, wet bulb, temperature, and water vapor levels (grams per kilogram and grains per pound). This utility tool will save maximum and minimum values until the memory is cleared, and it includes a data-hold button for quickly fluctuating measurements. Complete with a carrying case and a 9V battery.
Dew Point | -22 to 199 °F (-30 to 100 °C) |
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Relative Humidity | 0 to 100% |
Relative Humidity Basic Accuracy | ±2% |
Relative Humidity Max Resolution | 0.1% |
Temperature (Air) | -22 to 199 °F (-30 to 100 °C) |
Temperature (Air) Basic Accuracy | ±1.8 °F/1 °C |
Temperature (Air) Max Resolution | 0.1 °F/ °C |
Water Vapor | 0 to 1120GPP (0 to 160g/kg) |
Wet Bulb | 32 to 176 °F (0 to 80 °C) |
Certifications | CE |
Dimensions | 7.8 × 1.7 × 1.3" (200 × 45 × 33mm) |
Power | 1 × 9V battery |
Warranty | 2 years |
Weight | 7oz (200g) |