Works well but has some issues. For starters, if your 9 volt battery is a bit low, it won't show any warnings, it just stops working by shutting itself down. The small green insert has a bulge in the center back that makes it wobble when inserted. I laid it down to be flush, but it still sits over the case at both ends, so inserting or removing components for testing also causes wobble. I assume it will break at some point. If the manufacturer could improve the fit that would be nice. The green connector has another problem: when the lever is vertical, it is only held in place by friction and may fall out in use. There's no brightness adjustment on the display, which helps conserve battery life (IMO). it is too bright). I opened it and there is no overlay for it either. I don't speak Chinese, but there appears to be a warranty sticker on one of the screw holes on the case. They are not legally enforceable in the United States. It would be better not to see something like that. So overall pretty decent and useful, but it would be easy to make some small tweaks that I think would greatly improve the quality of this device.
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