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Specification : Easy to operate and replace the battery by coins, please kindly wrap the coins in cloth to avoid scratches products Minimum Temperature: 14°F (-10°C), Maximum Temperature: 140°F (60°C),Accuracy:±1°C/±2°F Count up timer range: 999 hours 59 minutes and 59 seconds Size: 3.5"x1.8"x0.6" Waterproof grade: IPX4 Power supply: 3V 1x CR2032 button battery,the life of battery is 4-6 monthes Package Includes: 2 pcs fridge thermomethers,4 pcs 3V CR2032 batteries, manual with color box package (batteries include)