By placing the probe in your pond you will get the water temperature displayed (outdoor)

The other temperature is the air temperature (indoor)

Perfect for koi ponds to monitor temperatures for feeding

Also measure humidity.

Features:
Material: ABS

Indoor Temperature: -50 ~+70 Centigrade (-58~+158 F)

temperature measuring Accuracy: ±1°(1.8F)

Outdoor Temperature: -50~+70 Centigrade (-58~+158 F)

temperature Resolution: ±0.1°(0.2F)

Indoor Humidity: 10%RH~99%RH

Humidity measuring Accuracy: ±10%RH

Use Battery: 1 * 1.5V (AAA) Battery(Not included)

Product Size: 98 * 58 * 14mm

wire length :1.4m

Package List:

1 * Digital LCD Thermometer Hygrometer(No Battery)

1 * User Manual(English)