Wireless temperature probe sensors measure and monitor air, liquid and solid surface temperature. The wireless sensor probe can be placed in liquids or places that require close contact temperature measurements, like heating pipes or soil. Aranet T-probe sensors are hermetically sealed and have IP class 68, which ensures exceptional durability in the harshest conditions.   Probe sizes available in 0.3m/1m/5m/10m 0.9ft/3.2ft/16.4ft/32.8ft More info https://aranet.com/product/wireless-temperature-probe-sensor/