The Extech RHT30 is a compact, easy-to-use USB datalogger that records up to 24,000 readings each for relative humidity (0.1 to 99.9% RH) and temperature (–22 to 158°F / –30 to 70°C). Designed for environmental monitoring in storage facilities, laboratories, greenhouses, and HVAC applications, it features a user-programmable sampling interval (30 seconds to 2 hours), password-protected security, 6-language support, and an 8-location bookmark function. Data is transferred directly to a PC via built-in USB, automatically generating time-stamped PDF or Excel® reports with trend graphs. A large 5-digit LCD and color-coded LED provide real-time status, while Max/Min tracking and long battery life (approx. 3 months) enhance usability.
| Relative Humidity | 0.1 to 99.9% RH | 0.1% RH | ±3% RH |
| Temperature (Air) | –22 to 158°F (–30 to 70°C) | 0.1° | ±1.0°F (±0.5°C) |
| Datalogging Interval | 30 seconds to 2 hours | — | — |
| Memory Capacity | 24,000 points per parameter | — | — |
| Power Source | 2 × CR2032 batteries (included) | — | ~3 months typical |
| Dimensions | 4.3 x 1.6 x 0.75" (110 x 40 x 19 mm) | — | — |
| Weight | 1 oz (90 g) | — | — |
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The Extech RHT30 is a compact, easy-to-use USB datalogger that records up to 24,000 readings each for relative humidity (0.1 to 99.9% RH) and temperature (–22 to 158°F / –30 to 70°C). Designed for environmental monitoring in storage facilities, laboratories, greenhouses, and HVAC applications, it features a user-programmable sampling interval (30 seconds to 2 hours), password-protected security, 6-language support, and an 8-location bookmark function. Data is transferred directly to a PC via built-in USB, automatically generating time-stamped PDF or Excel® reports with trend graphs. A large 5-digit LCD and color-coded LED provide real-time status, while Max/Min tracking and long battery life (approx. 3 months) enhance usability.
| Relative Humidity | 0.1 to 99.9% RH | 0.1% RH | ±3% RH |
| Temperature (Air) | –22 to 158°F (–30 to 70°C) | 0.1° | ±1.0°F (±0.5°C) |
| Datalogging Interval | 30 seconds to 2 hours | — | — |
| Memory Capacity | 24,000 points per parameter | — | — |
| Power Source | 2 × CR2032 batteries (included) | — | ~3 months typical |
| Dimensions | 4.3 x 1.6 x 0.75" (110 x 40 x 19 mm) | — | — |
| Weight | 1 oz (90 g) | — | — |