It is a Temp Power Volt Current Multimeter,Power Supply: 3.5-28V DC 12V,Temperature range: -55 °c - 110 °c (resolution 0.1 °c),Power meter range: DC 0.0-99.9W (resolution 0.1W),Voltage range: DC 0.00-33.00V (resolution 0.01V),Current meter range: automatic precision variable DC 0-999.9mA-3.000A.