An advanced thermometer/hygrometer capable of measuring indoor and outdoor temperature, as well as relative indoor humidity. The large easy to read LCD acts as a receiver unit for a separate outdoor sensor unit. It will record max and minimum temperatures for quick referral and conveniently displays the time of day. Ideal for temperature or humidity sensitive environments such as museums, greenhouses, or to check if your home and office is too dry or moisture laden. The LCD receiver unit is capable of receiving information from up to 3 sensor units, which are available separately (see part no XC-0324) Transmission frequency: 433.92MHz Transmission range: Up to 100m open air Sensor dimensions: 51(H) x 63(W) x 25(D)mm Relative Humidity : true Absolute Humidity : true Relative humidity range : 1% to 99% Measures in Celcius : true Outdoor / Exterior Scale : -45.000000 degrees Celsius, 65.0 degrees Celsius Indoor / Interior Scale : 0.0 degrees Celsius, 60.0 degrees Celsius Celcius Accuracy : +/- 1.0 degrees Celsius Thermometer Resolution : 0.1 degrees Celsius Records Minimum : true Records Maximum : true Data Hold : true Display Type : LCD Width : 114.0mm Height : 95.0mm Depth : 25.0mm Disposable battery required to power : Transmitter Battery type : AAA Battery Quantity : 2.0pc Are batteries included : false Batteries can be replaced : true Battery compartment location : Back How is battery compartment kept closed : Screw Sensor Battery Size : AAA Sensor Battery Quantity : 3.0pc