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 , we can measure the capacitor is bad/ damaged or good in condition.Our meter only applies less than 15mV DC or to on a good capacitor, as a result we can use it as in circuit test.During repairing TV, LCD, Audio board, etc. we can in circuit testing the capacitor is good or not. terminal, for fast and easy inspect general capacitor or resistor, a printed table for fast check.RangeAccuracy(After zero,Refresh Time(Manual Mode)tested with 1,10,100RAuto mode take 0 to 2s, more timeresistor depends on capacitance value.0.000 to 1.000R1%+2Digit~0.4s1.000 to 10.00R1%+1Digit~0.4s10.00 to 100.0R2%+1Digit~0.4sAccuracy: Up to 1% (detail on above table)Wide Measurement Range: Greater than 1uFHigh Resolution: 4 digit, or 0.001Ohm @ 1 ohm rangeMeasuring voltage: Less than ~40mV (TESTING VOLTAGE)External : 5V -USBOperating Current: 0.02ABattery: 2 * AA 1.5V Battery (not included)Battery Life time: Greater than 80 HoursItem Size: Approx 14.5 x 8 x 3cm / 5.7 x 3.1 x 1.2inItem Weight: Approx 139.6g / 4.9ozColour:Orange-yellowMaterial:plasticPackage Contents:1x Capacitance Meter2x Test ClipsOnly 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.