De-5000 High Accuracy Handheld LCR Meter with TL-21 & TL-22 Test Leads - Perfect for Electronics Testing, Circuit Repair, and Component Measurement

tl;dr Economical, easy to use and very accurate. The new inventory (March 2021) now ships with an English manual. However the unit does has its flaws.Problem #1: While I don't have any complaints about the device itself there is a major flaw. The 9V battery compartment does not have the traditional polarized connector. This makes it easy to insert the battery incorrectly and blow up the unit. The older models had a reverse sacrificial diode (mixed-signal fast switching SMD diode) across the battery terminal that would blow up if you reversed the battery this protecting the instrument itself. But this diode would bleed a reverse current of approx 2.5-5 uA even when the device was off and was the cause of all low battery life complaints. With the newer models they have removed this diode - allthough the diode place holder continues to be there. This improves the battery life significantly but can permanently damage your device if you accidentally reverse the polarity. I really wish that the manufacturers fix this design flaw. At the very least they can put the conventional 9v battery polarized connectors that prevent battery from being installed incorrectly.Problem #2: The official DC adapter is not readily available. Designed to use 3.5mm x 1.35mm connectors with the barrel length of 12mm with inside pin +ve and outside -ve 9v 650mA which is again unconventional. Official adapter costs an insane $40, which is almost 1/2 the price of what you pay for the device. For $120 DER should not cheap out on providing a generic power supply that would cost no more than $7 on Amazon. Problem #3: Adding a simple protective circuit on the measurement terminals against energelized capacitors will be welcome - although they will have to use extremely low inductance and low capacitance FETs to design that. Something like this will likely cause the cost to go up but nevertheless will be cheap insurance against the chips getting fried.Apart from these nits, the device by itself is absolutely fantastic. I have already used this for several projects it pays for itself. Used it to find bad capacitors and also compared it to measure inductance of several miniature Coilcraft SMD inductors with great accuracy. Having 4 frequencies to run the test against is really very useful. I am still giving this 5-stars.