Fast and Accurate: Quickly and accurately determine overall battery health. And the Battery Load Analyzer allows you to test batteries both in-vehicle and out-of-vehicle, even test dead batteries. Simply connect the clips of the tester to the battery, then it will turn on and ready to test and analyze the battery. Show Battery Data: Provides basic battery parameters such as such as voltage, internal resistance, cold cranking current and AH capacity, battery health and charging status, shows you professional tips for replacing or charging the battery. Plug and Play: It is simple to use, just connect the clip of the battery tester to the car battery correctly and it can start working whether the battery is in the vehicle or out of the vehicle. A discharged battery can be tested. With a large LCD display with white backlight and contrast adjustment, directly shows test results. Easy to carry and worry-free for outings or business trips. Reverse connection protection: Red connects to the positive of the battery and black connects to the negative of the battery. battery, the battery tester works normally. if the clip is not tightened properly, the screen will flicker, the clip is tightened properly, the screen will not flicker. Tips: 1.You need to turn off the engine to test. 2. This device does not need a built-in battery. 3. When testing a discharged battery, please charge the battery. Like: DigitalVoltage measurement range: 5-35 (V)Voltage measurement accuracy: 0.01 (V)Measuring range of internal resistance: 0.1-500 (m)Measuring accuracy of internal resistance: 0.1 (m)Temperature measuring range: 20-60 ()Temperature measurement accuracy: N/A (C)Capacitance measurement range: 2-2000 (AH)Capacitance measurement accuracy: 0.1 (AH)Supply voltage: 4.5 (V)Power: 1.5 (W)Weight: 0.26 (Kg)Dimensions: 27.5cm * 16cm * 4.5cm