1. The measuring range is 0-25, divided into two gears: 0-5 and 5-25, automatically switched. 2. Resolution: 0-5 is 0.01, 5-25 is 0.1. 3. Measurement accuracy: 0-5 range 1.5%0.01, 5-25 range 1.5%0.1. 4. It can measure the ESR of the electrolytic capacitor, and also measure the (direct current resistance), which can be switched by the ON/OFF/ZERO button. 5. The synchronous detection is used for short circuit, so the tested value is the real ESR. It can be measured in-circuit and off-circuit, the measuring current is 5mA, and the measuring frequency is ESR measuring industry standard frequency 100kHz. Automatic zero point adjustment at power-on, automatic zero point adjustment is also done when ESR and are switched. While the LCD displays the ESR value, it also displays the probe compensation value, which is convenient for the user to adjust the time to the highest accuracy. The input terminal has overvoltage protection. Manual and automatic shutdown functions, automatic shutdown is an intelligent way, and it will automatically shutdown if it is not used for about 5 minutes. When the power supply voltage is too low, the LCD will prompt and it will automatically shut down after 10 seconds. Use a 3.7V 14500 lithium rechargeable battery, which can be while using it. The charging power supply is DC5-6V, and there is a charging indicator on the left, which is red when charging, and green after charging. The charging time is 2-3 hours. The maximum working current of the whole machine is about 60mA (3.7V). Working temperature: 10-40 Material: plastic colour: As shown Package Contents: 1 x ESR-2501C tester 2 x Test pen 2 x Test clip 1 x USB cable 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.