The Amprobe® Test Tools Data Sheet introduces the features and characteristics of the THWD-3 Relative Humidity Temperature Meter. It has a dual display, an extended probe stem for easy access to air ducts, a wide measurement range, and multiple display options including dew point and wet bulb.
The THWD-3 provides simultaneous readouts of relative humidity, temperature, dew point and wet‑bulb values on two LCD displays. Its extended probe stem allows easy access to ducts and hard‑to‑reach locations, and the unit includes a soft carrying case, sensor cover, battery and user manual.
Technical specifications include a humidity range of 0‑100 % RH, temperature range of –20 °C to 60 °C, accuracy of ±3 % RH (0‑95 % RH) and ±0.8 °C (dry‑bulb), response times of 180 s for humidity and 10 s for temperature, a 9 V battery life of about 85 hours, and dimensions of 240 × 54 × 34 mm weighing roughly 180 g.
| Humidity range | 0 % RH to 100 % RH |
|---|---|
| Temperature range | -20 °C to 60 °C |
| Humidity accuracy (0‑95 % RH) | ±3 % RH @ 23 °C |
| Temperature accuracy | ±0.8 °C |
| Resolution (humidity) | 0.1 % RH |
| Resolution (temperature) | 0.1 °C / 0.1 °F |
| Response time (humidity) | 180 s |
| Battery type | 9 V (NEDA 1604 / JIS 006P / IEC6F22) |
| Battery life (continuous) | 85 hours |
| Dimensions | 240 × 54 × 34 mm (9.5 × 2.1 × 1.3 in.) |
| Weight | ≈180 g (6.4 oz.) |
It measures relative humidity from 0 % RH up to 100 % RH.
The 9 V battery provides about 85 hours of continuous operation.
The temperature (dry‑bulb) accuracy is ±0.8 °C over the –20 °C to 60 °C range.
In slowly moving air, the humidity response time is 180 seconds.