Operating Conditions: 0-40C, 25% - 80% RH Product size: 113x64x30mm Product weight: about 48g Standard configuration: bare watch (no battery required) EASY TO READ: The handheld device is designed to be easy to read: the battery voltage is displayed on the LCD screen. Power Saving: You can easily test the battery voltage, determine whether the battery capacity is low or high, and prevent us from wasting a perfect battery by throwing away a good battery. Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be a certain color difference, depending on the physical object received Delivery quantity: (according to the main image)