No check valve=useless

No check valve. At least not on the one I got. This makes it useless as a compression checker as it does not hold the pressure reading. Gauge pressure just goes up and back down as you crank the engine. I took it apart because sometimes the Schrader valve fails but there is definitely no check valve anywhere on this thing. Waste of my time. Had to go get a $30 set from Harbor Freight. Half the cost and worked like a champ. Plus, the quick connect fitting is smaller so I was able to use it easily on my son’s 1998 TDI.

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