It works very well and is simple to operate. It provides data on the performance level of each transistor as well as just providing a fail- pass scenario. I like the rechargable cell , however I think I will not be so happy with it when it fails because there is no provision for replacing it. It is a very well thought out product and it has exceeded my expectations.
I tested a few mosfets and the battery voltage dropped below what was needed for testing. I charged the battery and turned it on and nothing but a black screen. I search the internet for help and found this is a common problem with these units. Don't waste your money on this tester, spend a little more and buy a good one like I did.