1It is a series resistor inside capacitor, using 100kHz to remove the impedance 1/(2*pi*F*C). 2 The impedance become small, and we can then measure the true series resistor value. 3 Using this theory, we can measure the capacitor is bad/ damaged or good in condition. 4 Our ESR meter only applies less than 15mV DC or peak to peak on a good capacitor, as a result we can use it as in circuit test. 5 During repairing TV, LCD, o board, etc. we can in circuit testing the capacitor is good or not.Features: It is a series resistor inside capacitor, using 100kHz to remove the impedance 1/(2*pi*F*C). The impedance become small, and we can then measure the true series resistor value. Using this theory, we can measure the capacitor is bad/ damaged or good in condition. Our ESR meter only applies less than 15mV DC or peak to peak on a goodcapacitor, as a result we can use it as in circuit test. During repairing TV, LCD, o board, etc. we can in circuit testing the capacitor is good or not. Dual terminal, for fast and easy inspect general capacitor or resistor, a printed ESR table for fast check.Specifications:Model MESR-100 Range Accuracy (After Zero, tested with 1,10,100R resistor)Refresh Time (Manual Mode)*Auto mode take 0 to 2s more time depend on value0.000 to 1.000R1%+2Digit0.4s1.000 to 10.00R1%+1Digit0.4s10.00 to 100.0R2%+1Digit0.4sAccuracyUp to 1% (detail on above table) WideMeasurement Range: >1uF (for 0.1uF the error will be larger onequation 1/(2*pi*F*C) @ 100Khz )High Resolution4 digit, or 0.001Ohm @ 1 Ohm rangeMeasuring voltage80 HoursOperating current 0.02ASize 14.4*8.1*3.1cm/5.7*3.2*1.2in Weight Approx.219g/7.7oz Package List 1 * Capacitance Meter (battery not included) 2 * Test Clips 1 * User Manual 5V micro USB