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Features: Measurement Range: DC 0-3. 0000A Power Supply: DC 3. 5-30V Display: five 0. 36" LED digital tube Display Colour: Red Refresh Speeds: > 3 times per second Measurement Accuracy: (0. 5 ‰ + 2 digits) Operating Temperature: -10 °c ~ 65 °c Dimensions: 48 x 29 x 21mm Temperature Coefficient: less than 50PPM / °c Built-in shunt, don't need extra shunt Anti-reverse protection Wiring: PWR-Red(thin): power supply+ (3. 5-30V DC) PWR-black(thin): power supply- (when powered by measuring circuit, connect nothing) Red(thick): current measurement signal input+ Black(thick): current measurement signal input- (please refer to the pictures for more details) Note: This meter needs separate power supply, the power is DC3. 5-30V. Package Includes: 1x Digital Ammeter