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Wireless Thermometer
Model # DE-31
digital thermometer at Der Ee Electrical Instrument Co., Ltd.
Features:
RF Transmission  
Remote monitoring temperature change  
Dual display of temperature from two positions  
Auto refresh data  
Alarm mode for HI or LO temperature set  
Auto data logger  
Max/Min temperature memory with time indication  
24 hours clock indication  
Indoor / Outdoor use  
With rubber holster for protection  
Specifications:
Temp. Range Main unit : -20 °C ~ 50°C (-4°F ~ 122°F)
Temp. Range Sensor unit : -20°C ~ 50°C (-4°F ~ 122°F)
Accuracy 1.0°C (2.0°F)
24 sets auto data logger every 30 minutes
RF transmission range Around 100 feet (300M) at open space
RF transmission frequency 433 MHz
Interval of transmission from sensor to main unit 3 minutes
Dimension - Main unit 120(L) x 100(W) x 26(H)mm [4.72"(L) x 3.94"(W) x 1"(H)]
Dimension - Sensor unit 92(L) x 70(W) x 26(H)mm [3.62"(L) x 2.76"(W) x 1"(H)]
Weight approx. 180g (main unit), approx. 100g (sensor unit)
Power Alkaline battery AAA 1.5V x 4