Works well; no instructions provided so had to experiment to figure out some features. Averaging feature is very helpful. Case is OK but could be better with a internal pocket for tubing/fittings. Good value product for casual occasional use. I use it to monitor pressure dtop across air filter.
build quality of unit is very good but the case is a little disappointing given the quality of the tester. It is just a zippered piece of thin folded cloth with no pockets for the hoses and connector, so if you unzip it all the way open to get to the stuff inside, they can all fall out....also the manual was printed bigger than the case so you would need to fold it in order to store it in the case. Aside from that the meter seems very good for the price. I will test it on my furnace tomorrow and leave additional feedback. The unit does zero/reset, has min. max avg and a back light if needed. Shipped very fast.
works good. unit zeros but the last most sensitive digit always flickers back and forth 1 unit