Measure the remaining battery capacity percentage (using the battery grid) and the remaining capacity AH number.Measure the magnitude of DC positive and negative bidirectional current. Measure the .Measuring DC positive and negative power size.Measure the positive and negative DC positive and negative cumulative energy size.Over-voltage alarm flashing function, the alarm voltage size parameters can be set. Low voltage alarm flashing function, the alarm voltage size parameters can be set.Overcurrent alarm flashing function, the alarm current size parameters can be set. The remaining battery low alarm flashing, the battery will continue to flash, prompting the user to charge.Charging, battery water light rolling tips.Full voltage automatically fill the battery capacity function. Clear current function.Clear the accumulated power function.Backlight can be manually turned off or on. Power-down data save function, power-off when the battery power, accumulated power, etc. are automatically saved when power-down. sensor isolation measurement, safe, reliable, easy to install. full-viewing angle LCD screen, 360 degrees without dead ends. With backlight, no matter night, daytime, interior, room Outside, direct sunlight are clearly visible. Wide supply voltage range: DC5 ~ 90V Current resolution 0.1A 0.1A 0.1A 0.2A Supply voltage range DC5 ~ 90V Voltage measurement range DC0 ~ 300V Voltage resolution 0.1V Capacity measurement range 0 ~ 999AH Power measurement range 0 ~ 999KW Energy measurement range of 0 ~ 999KWH Table measurement error + -1% Refresh rate of 0.5S refresh time to display information Installation slot size 76.0mm x 39.5mm Sensor threading hole diameter 20mm Operating current when the backlight is lit: 10MA. When the backlight is off: 4MA. Colour:Black Material:plastic type:F: 400A With Bluetooth Package Contents: 1 x Hall Coulomb Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.