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This is DROK 2 in 1 car Voltage & Temperature Multimeter. it is very easy to use Plug-in meter for measuring car voltage and Temperature. To start reading, just simply plug in cigarette socket. the top light red led display the Temperature in Fahrenheit. the bottom light is the voltage.
The External temp probe design for better measure the Temperature. however, sometimes car heating parts or sunlit area would affect the measure results. you can bent or turn around the probe to get the Accurate monitor.
Wide voltage range can use in 12V car or SUV, or 24V truck bus. the different voltage Reflect the working status of charger. below is the battery voltage status for reference.