Checktemp® Dip is an accurate thermometer measuring from -20 to 100° C ( -4 to 212° F) . The stainless steel probe with a flexible 3 m ( 9.9' ) cable is weighted so that it can be dipped into any vat or tank to measure the temperature at different depths. Due to its hygienic stainless steel probe, it is ideal for food applications, especially to check the temperature inside wine casks and milk tanks. Checktemp® Dip can also be used for applications such as fish farms, water reservoirs and pools where the operator can simply stand on the edge of the water and throw the probe over. In addition, you can check to make sure that your thermometer is measuring the right temperature with HANNA exclusive CAL CHECK® technology. The battery life is a remarkable 3 years with a normal AAA battery.