Adding an hour meter without modifying your compressor in any way

I have used both. The direct powered one was wired into the pump motor connector so it only ran when the pump was running. It is still working after almost 3 years. Coincidentally my sealed battery vibration activated one was found dead yesterday at 2 years and 1 month past the purchase date.

A direct powered one needs to be vibration activated with a setting that doesn't turn on the meter when the cooling fan is running or wired to the pump motor. I won't be buying any more with sealed in batteries. I can see how that would be good for something that is used outside, but not on my compressor.
 
Geezerwood, Do you have it set on Sen 1 or Sen 3?

Sorry, never saw the notification. I had it set on the lowest sensitivity which I assume was Sen 1, but I can't check it as it is now DOA, about one month past the warranty. I cut into it to see if I could replace the battery, but so far have not been able to find the battery in there. The PCB is solidly glued in. I don't think I can remove it without destroying the unit.