Testo plastic wireless temperature probe with external probe connection and internal NTC sensor, plus door contact input. 2.4 GHz frequency. Current measurement data, battery status and signal strength are shown in the display. In the event of a transmission interruption data is saved in the probes' memory. Measuring range: -22 to 122 degree F. Accuracy: +/-0.7 degree F (-13 to 122 degree F), +/-1.4 degree F (remaining range). Resolution: 0.1 degree C / degree F. Measuring range (Instrument): -58 to 302 degree F. Accuracy (Instrument): +/-0.4 degree F (-13 to 158 degree F), +/-0.7 degree F (remaining range). Resolution (Instrument): 0.1 degree F/ degree C. Connection: NTC via mini-DIN socket, door contact connection cable included in delivery (5.9'). Battery life (Type: 4 AA batteries): Battery life at 77 degree F, 3 years; for freezer applications, 3 years with L91 Photo lithium Energizer batteries). Protection class: IP68. Measuring rate: Standard 15 min, 1 min to 24 h can be set. Conformity with standards: DIN EN 12830. Operating temperature: -31 to 122 degree F. Storage temperature: -40 to 122 degree F (-40 to 50 degree F). Transmission distance: approximate 984.3' free field at a frequency of 868 MHz, approximate 328.1' free field at a frequency of 2.4 GHz. Included wall bracket. Display: LCD, 2 lines; 7-segment with symbols. Measures 3-25/64" length by 1-1/2" width by 3-3/16" height.