Review on ICQUANZX LCR-T7 Transistor Tester: Advanced TFT Diode Triode Capacitance LCR ESR Meter by Jeff Labore

I used it for about a week before it wouldn't turn on. Now I plug it in to charge and it lets me test things, but every reading seems about 30% higher. When I turn it off, the screen flickers between off and full white until it turns off. It has good battery voltage readings but is completely non-functional. I contacted the seller but they don't seem to be very interactive.