Precautions: 1. The meter with a range of 50A or 100A must be connected to the shunt to power on, otherwise it will burn out. 2. The power supply range of this watch head is 4~30V (out of range will burn out), the measuring range is 0~100V.    Technical Parameters: Voltage measurement range: 0.0V-100V

Current test range: 0-999mA, 0-10A, 0-50A, 0-100A (4 ranges are optional)

Power supply range: DC4-30.0V

Voltage error: ±0.1%

Current error: ±1%

External shunt specification: 75 milliohms

Working current: < 20mA

Refresh rate: about 300mS once

Display mode: double three-digit 0.28" LED digital tube

Display color: red + blue

Lead length: 15cm

Dimensions: 48 x 29 x 22 mm, length X width X thickness;

Mounting hole: 46 x 27 mm

Working temperature: -10 ° C ~ 65 ° C