Mityvac MV5530 Engine Compression Test Kit, Manual Pressure Release, 2-3/4 in. Bourdon Tube Gauge, Quick-Disconnect Coupler, Includes Threaded Adapters for Motorcycles, Marine and Small Engines

Very nice piece of equipment. A must for small engine (as well as automotive) diagnostic work.This unit has Schrader valves on all the hoses, where they screw into the spark plug hole. This gives a much more accurate reading.Also comes with spare parts such as o-rings and Schrader inserts.

Used on several engines and works great. No leaks. Can’t guarantee accuracy but it gives constant readings to help diagnose engine issues. I recommend it.

This is the one you want! It has everything you need to do your compression tests!

I would have preferred that the hoses were extensions instead of having fixed attached plug hole adapters. This would have made it possible to adjust the length making the unit more flexible. That said, good set. I only checked one cylinder so actual accuracy is unknown but better than my old (15 years +) KD Tools which read 125lbs on all cylinders. Cold Block Test of 350 #1 Cylinder with 111,000+ miles: 3 test results were Consistent -155lbs 155lbs 155lbs and held pressure.

My WRX needed a compression test. Instead of a shop charging 125-200 for them to do it I learned to do it myself.This kit is extremely nice and feels very high quality. I had thought about renting one or borrowing one but honestly I wanted a tool I could know and trust which is why I bought new.This kit, even though it says made in Taiwan, feels very well constructed. the adapters are of good quality and honestly I would have paid up to $120 for this now. All the adapters are clamped on so no fiddling with worm clamps or potentials for leaking air giving false readings.It also came with a multitude of adapters which were all good quality.I had to test my WRX while it was at operating temperature. I needed a tool that was durable, good quality, cheap, and most importantly accurate. This was the tool. I now know my engine is healthy as a horse so I am quite pleased. The miata is next.Seriously this is a good kit.

Nice compression set with a good case. I service small engines and have used this set on several mowers, trimmers, blowers and weed trimmers. Great to have when buying used equipment also.

looks good

Used it on checking the integrity of the cylinders on a 2017 Kia Forte and it performed flawlessly. Easy to use and didn't break the bank. Liked the big numbers on the gauge and I really liked that it came with extra seals and valve core stems. I'm really starting to like MityVac products. I own this kit and the Brake Bleeder (Metal Housing) and they both performed exceptionally well.