HI 147 is a temperature monitor with magnetic backing & remote thermistor sensor on a 1-meter cable. This is the ideal thermometer when you need accurate, reliable internal temperature readings while monitoring from outside. Checkfridge™ incorporates HANNA's unique Cal-Check™ feature which allows the user to calibrate the thermometer internally. The magnetic backing provides flexibility and ease of location and relocation at your convenience. A low battery warning "ERR" message completes HI 147's rich features.