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For those who would like to perform unit calibration, here is the information and it is also works on Mastech MS5308, UNI-UT612 or whatever using Cyrustek ES51919 and ES51920 chip set.For DE-5000, adjust DC 500mV between TP1 and TP2.For others, adjust DC 500mV between pin 26 and pin 28 on ES52920.
I have LCR meters already, including the AVO Megger B131, Wayne Kerr 4210 and Uni-Trend UT-203. From these units I have established the pros and cons of the different models and one glaring omission annoys me royally. None of these meters can measure ESR