1. MINI USB port with DC5V power supply and built-in lithium battery. 2. LCD display + four-wire jack: a group of circuit power supply, a group of circuit test. 3. ESR table: Some capacitors can be compared for comparison test only outside the range of ESR value reference table. 4. Widely used: instrument maintenance, school experiments, engineering development, scientific research engineering, production lines, electronic equipment, etc. 5. Reset button: open circuit reset when testing capacitance, short circuit reset when testing capacitance, ESR. (Note: large voltage capacitor must be discharged before testing)Straight plug discharge socket: test large voltage capacitor can be inserted into the capacitor pin, discharge socket, after the completion of automatic discharge to test (note: discharge socket can not be directly used for testing). Model number: MEC-100 Accuracy: up to 1% Capacitance: 0.0uF-470,000uF(470mF) Internal resistance of capacitor: 0.00Ω-470.0Ω High resolution: 5 digits Measuring voltage: Less than 0.8 volts (V) Clamping voltage: -1.25 V(open circuit voltage) Built-in battery: Lithium battery charging External power supply: 5V micro-USB port Operating current: Greater than 80 hours Colour:Blue Material:plasticPackage Contents: 1 x ESR Multimeter AanalyzerOnly 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.