Extech RHT30 USB Humidity/Temperature Datalogger
The Extech RHT30 USB Humidity/Temperature Datalogger gives a simple way to monitor environmental conditions over long periods. It records humidity and air temperature readings and stores up to 48,000 data points for later review. A built-in USB connector allows quick transfer of data directly to a PC.
Designed for routine monitoring, the Extech RHT30 USB Humidity/Temperature Datalogger combines a compact body with an easy-to-read LCD display. Colour LEDs show operating status at a glance, while password protection helps keep stored information secure. Users can also set alarms to warn when limits are exceeded.
Flexible Data Recording
Logging intervals can be programmed from 30 seconds up to 2 hours, making the unit suitable for both short-term checks and long-term monitoring. The Extech RHT30 USB Humidity/Temperature Datalogger measures humidity from 0.1 to 99.9% RH and temperatures from -30°C to 70°C. In addition, readings can be exported in PDF or Excel format for reporting and record keeping.
The built-in humidity sensor and NTC thermistor provide dependable measurement performance in changing environments. A bookmark function lets users mark up to eight locations during logging sessions. This helps organise readings when monitoring several areas.
Simple Data Management
Key Features
- Stores up to 48,000 logged readings
- Direct USB connection for PC data transfer
- Exports files in PDF and Excel formats
- Built-in NTC thermistor temperature sensor
- Integrated capacitive humidity sensor
- Programmable high and low alarm settings
- Password protected data security system
- Easy-to-read LCD display
- Colour LED status indication
- Supports six selectable languages
- Bookmark function for up to eight locations
- Compact housing for portable monitoring tasks
- Suitable for long-term environmental recording
- Two set types available to meet different requirements
Technical Specifications
| Product | Extech RHT30 USB Humidity/Temperature Datalogger |
| Data logging interval | 30 seconds to 2 hours |
| Memory capacity | 24,000 points per parameter, 48,000 readings total |
| Relative humidity range | 0.1 to 99.9% RH |
| Relative humidity accuracy | ±3% RH |
| Relative humidity resolution | 0.1% RH |
| Temperature measuring range | -30°C to 70°C (-22°F to 158°F) |
| Temperature accuracy | ±0.5°C (±1.0°F) |
| Temperature resolution | 0.1°C / 0.1°F |
| Sensor type | NTC thermistor and capacitive humidity sensor |
| Bookmark locations | 8 positions |
| Language options | 6 selectable languages |
| Data output formats | PDF and Excel spreadsheet |
| Power supply | 2 × CR2032 1.5V batteries |
| Dimensions | 110 × 40 × 19mm |
| Weight | 90g |
| Certification | CE |
| Warranty | 2 years |
Document Downloads
What’s Included
- Extech RHT30 USB Humidity/Temperature Datalogger
- 2 × CR2032 batteries
- User documentation

