Review on Supco DDM55 Differential Manometer Resolution: Unbeatable Accuracy and Precision by Donnie Boss

Excellent strength. Very easy to use. Contains hoses and two hose fittings. Worked great. Highly recommended. Update: I turned this on last week and found the battery was dead. The screen blinked as usual, but then went off. Put new battery in, same result. Frustrated, I set it down fairly firmly on the granite countertop and suddenly it started working as usual. There were no problems before or after. Although I have a backup, I was surprised (as I think with this device) that it seems to have some sort of malfunction here. It's checking the same as my backup, so maybe some connection/humidity? Only for my device? If anyone else comes across it, by all means give it a light tap. That's why I downgraded the rating by one star.