The Center 370 handheld thermometer c/w single RTD sensor is waterproof - rated IP67. The RTD sensor is a 4 wire PT100 which offer affordable accuracy.

Specifications:
Resolution: 0.1 °C
Accuracy: ±0.1% of reading plus 0.4 °C
Measurement Range: -100 to 300 °C
Supplied with 1 x TP-R01 Probe

Features:
- IP67 water proof Housing
- Pt100 temperature sensor for improved accuracy
- Pt100 3850/3926/3916 RTD standard
- Max/Min/Avg Function.
- LCD back light.
- °C, °F scale selectable
- 3 sectors battery life indicator.

PDF file available here