Extreme working conditions: Min. supply voltage: + 3.5V Max. supply voltage: + 30V Working temperature: -10 ~ + 65 Operating Humidity: 10 ~ 80% (non-condensing) Working pressure: 80 ~ 106kPa Sunlight: no direct exposure<br><br>Link information Power meter: Two line socket Thin - Black Line: Header supply Negative Thin - Red line: Header supply positive (Note: voltage between red and black lines can'for t exceed 30V) Test side: Three line socket COM: Test Common V +: Test positive voltage input A +: Test "positive" current input; check the drawing before install or it will burn. Because the header by co-design, which means the earth wire of test and power supply is interlinked,so only can be connected to between the negative power supply and the negative of the tested device (We recommend to link the yellow line and the black lines together, to prevent outside interference caused by digital ammeter flashing) Specifications: Material: Plastic Color: Black/White Voltage Measuring Range: 0.00-99.9V Voltage Resolution: 0.01V(Below 10V) 0.1V(10V-100V) Impedance: >100K Current Measuring Range: 0.00-9.99-20.0 Current Resolution: 0.01A(Below 10A) 0.1A(Above 10A) Supply voltage (non-isolated meter): for DC 3.5 ~ 30V (wide range) Note: The maximum input voltage can not exceed 30V, otherwise it will be burned Isolation meter (isolated power supply meter): DC8-18V Operating Current: