Review on Supco DDM55 Differential Manometer Resolution: Unbeatable Accuracy and Precision by William Pacino

I needed a pressure gauge to check natural gas and propane pressure when troubleshooting small and complex engine problems. This manamter is the first one I have and it gives me the range I was looking for including negative pressure (vacuum). Along with my very expensive emissions meter, this tool quickly became indispensable for troubleshooting both raw and clean gas problems and allowed me to tune both the high and low frequency controllers to set the most efficient engine parameters in a fraction of the time. Spent guessing like I used to do