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Package Includes:4 x Small Hygrometer Thermometer. Products Specification: Temperature measuring range: -58℉-158℉ (-50℃-70℃) Temperature measurement accuracy: ±2℉ (±1℃) Humidity measuring range: 10%-99%RH Measuring humidity accuracy: ± 5% Measures conditions time: Every 10 seconds Install panel hole size: D42mm Operating Voltage: 1.5V, one button cell size LR44 Material: PVC plastic Size: 1.7" x 1.7" x 0.5" Kindly Note: There is a hole in the case to the circuit that is marked C/F . Please use a paperclip to press the circuit through that hole. It will switches from C to F.