For "-10" is our company's first handheld high-precision attery internal resistance meter. It is a true four-wire measurement internal resistance meter, designed with precision, convenient to carry. The device can automatically test internal resistance and voltage values simultaneously, with measurement results displayed on the screen. Users can also manually adjust the voltage and resistance range. The product features a sorting mode, automatically filtering the good and bad batteries based on user-set thresholds. It also supports historical records and exporting data tables of historical measurements. Voltage measuring range:0 - 100V(DC) Voltage gear:Automatic, 1V, 10V, 100V Resistance measuring range:0-200ohm Resistance gear:Automatic, 20mohm, 200mohm, 2ohm, 20ohm, 200ohm Accuracy:0.5% Instrument frequency:AC 1Khz Rechargeable:Type-C interface (5V/1A) Built-in battery:1000mAh lithium battery User calibration:Support Sorting mode:Support History recoed:Support Recorded data export:Support Working environment:-10 - +45, relative humidity Less than 80% Storage environment:-20 - +80, relative humidity Less than 80% Weight:225g Colour:Blue Material:ABS Size:158.7x80.5x28.4mm Package Contents: 1 set * lithium battery internal resistance 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.