Description: - Brand new and high quality. - PWR: Power supply DC6-28V, Red:+ Black: - . - IN: test current 0 ~ 9.99A, Red: + Black: - . - Note: The power supply cord must be careful that the polarity is not reversed, otherwise the meter would burn out . - Range: DC0-9.99A (need external power supply, DC7-25V) . - Display: Three digital 0.56" LED tube . - Refresh rate: about 500mS / times . - Accuracy: 1 %(+/- 1 digit) . - Power Supply: DC6-28V . - Operating temperature: -10 0C ~ 65 0C. - Size:4.8cm x 2.5cm x 2.9cm - 1.89inch x 0.98inch x 1.14inch.