FEATURES The battery internal resistance tester can measure internal resistance and voltage of the battery at the same for time. The Kelvin four-wire test clamp is adapted in order to better avoid the influence of contact resistance and wire resistance, and more accurate measurement can be performed This product adopts intelligent contrl, liquid crystal display, and simultaneous insertion of Kalman flter mathematical algorithm, which has the advantages of high precision, high eficiency, low cost, light weight, energy saving and environmental for protection. Built-in 1000mAh lithium battery,5V charging. Android mobile phone charger can be used, which is very convenient. This product is widely used in various battery production, maintenance, testing, scientific research laboratories and other occasions.It can also be used to measure AC resistance of capacitors and resistors with low resistance and high precision. SPECIFICATIONS Parameters Accuracy:AC resistance, for DC voltage, R:0.5%, V:0.5% Measurement Range,Signal SourceRange: R:0.01mQ ~200MV:0.001V~t75VDCV AC:1kHz At 20m@ range:50mA At 200mQ/ 2Qrange 5mA At 20Q/200Q range:0.5mA R:Automatic and Manual.5ranges V: Automatic and Manual,3 ranges Speed:10 times/second Adjustment: Correction for resistance and voltage separately Factory Setting: Save factory information, restore factory state with one key Backlight: Can turn it on/off by entering setting menu Energy Saving Settings: 30 minutes delay, it will be turned off automatically if no operation Application: Battery maintenance for mobile, computer, battery car;battery factories check and test Result Display: LCD display, direct reading GENERAL FEATURES Power Supply: Built-in lithium battery, Be suitable to use5V1A Android mobile phone charger Size: 166mm (Length)~80mm(Width)28mm(Height) 173.5g Language:English and Chinese switchable Note: 1. calibrated before shipment, please do not arbitrarily restore the factory 2. If you need software, please contact us. Package include: 1* Battery Internal Resistance Tester 1* Test clip 1* User's manual