I really liked this unit when I opened the box - compact, light weight and with a good carrying case. It would help if the cable from the base of the unit to the busbar connection was longer, although it probably would not fit in the unit's built-in storage compartment. I tested it before connecting, it worked fine. I later tried using it in another application and it didn't reach my set value of 30psi, which was normal for that application. When I used it to blow water out of my van's open plumbing lines, the readings never exceeded 10psi. The block worked stably and did its job. I give 4 points because I just received this device and haven't had a chance to test it until now.