The Extech RHT20 is a compact, standalone USB datalogger that records up to 16,000 readings each for relative humidity (0 to 100% RH) and temperature (–40 to 158°F / –40 to 70°C). Designed for environmental monitoring in warehouses, cold storage, shipping containers, offices, and laboratories, it features a user-selectable sampling interval from 1 second to 24 hours and includes a built-in LCD that displays real-time, Min/Max, and alarm status. Data is easily downloaded via USB to a Windows® PC using the included software. The unit also includes a mounting bracket with a combination lock for secure placement and is powered by a long-life 3.6V lithium battery.
- Records 16,000 humidity and 16,000 temperature readings (32,000 total)
- User-programmable sampling rate: 1 sec to 24 hr
- Built-in LCD shows current readings, Min/Max values, and alarm status
- Visual and audible alarm indicators for user-set RH and temperature thresholds
- USB interface for easy setup and data download—no external cables needed
- Includes Windows®-compatible analysis software
- Mounting bracket with combination lock for secure, tamper-resistant installation
- Powered by a 3.6V lithium battery (included)