We've done a ton of research on vacuum gauges since we no longer use the u tube mercury manometer. We found the most reliable and accurate electronic vacuum gauge is the Yellow Jacket 69060
It doesn't look as sophisticated as others with LCD displays, but it is a laboratory quality instrument that I have had great success with, but it is very pricey compared to other models. It is A/C powered which can be a drag. But I'll sacrifice convenience for accuracy and reliability.