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Universally Trusted Tools
Millions of master mechanics and DIY devotees worldwide are choosing OMT to start their own automotive stories.
As a professional manufacturer of automotive tools, we’re here to help keep your vehicle in top condition because you don’t need more cars in your life; you need more life in your car—That’s the Orion Motor Tech way.
8 Pc. Cylinder Compression Tester Kit
for Automotive & Motorcycle Gas Engines
- Our lightweight gauge is equipped with a shock-absorbing rubber cover, anti-scratch acrylic window, and easy-to-read dial with both psi and bar scales to handle foreign and domestic vehicles.
- This kit and its included straight and curved adapters fit the spark plug cylinders found in the gasoline engines of most motorbikes, cars, and trucks whether American-made or imported.
- The universal rubber cone adapters provide quick and easy connections to all the most common spark plug types and depths.
- The durable rubber hosing and the sets' non-corroding brass and aluminum components ensure years of dependable service.
Precision Threading
Tight tolerances and precision engineering mean each adapter screws in with a tight seal, eliminating leaks and saving you money.
Reinforced Rubber Hose
Resisting both crimping and deformation, the reinforced rubber tubing handles high pressures with ease for years of reliable servicing.
Superior Durability
Made from premium brass and aluminum, each component provides superior strength alongside resistance to chemical corrosion.
sonny r jones
2025-09-03 20:37:25
Gauge was more than 30 pounds out of calibration..used hose and fittings to repair my old one..Still good enough deal with using as parts
Big Rudy
2025-08-31 09:26:30
When purchasing an automotive project, one of the first things I do is to take a compression test to determine the condition of the motor. This tester comes with all the needed attachments and is easy to use! It also comes in a nice case for storage! A great price too!Big Rudy
JohnnyReviewPants
2025-08-27 09:53:31
EDIT: though I was well past the return date because I wasn’t at the point of my tune up to test my compression, as other reviewers said, the customer service was fantastic, and they sent me a replacement gauge. So, you can purchase knowing that if there’s an issue, you will be taken care of by this seller. Thank you!Original review:Pressure not accurate. Did test twice on separate days (because I was so disappointed in my results initially). Yes, my engine was warmed up, yes I had the throttle fully open, and yes the choke was open (not choked). My results were CONSISTENT, but not accurate. Gauge measured 90, 65, 85, 90. Then I did the tsp of oil test down the spark plug wells, and I got 95, 90, 90, 95. Yes, I know no. 2 is a little off, and it would be a concern at this level. I took my bike to my mechanic to weld a hoop on, as I don't have a welder, gave him my numbers and asked him to check for me. I went in today, and he said my compression was fine: 150, 125, 150, 150 and that while no. 2 is a little concerning, its within the range that I'll be O.K. at least for now. Of course, I'm past the return time, so I'm stuck with an inaccurate compression tester.
Lloyd Edwards
2025-07-13 13:06:49
great low price. all the necessary fittings are included. Unfortunately, I discovered that one cylinders rings were bad and had to replace the car's engine.
safaripolice
2025-06-14 18:48:15
Very disappointed with this product. The 30 day period is over so no easy return and it literally will give you different readings for the same cylinder no matter how many times you try. It also fell apart at the gauge connection and I had to reattach and fix it. I just can’t believe this is sold as an accurate product for someone testing something so important like a car or tractor engine. I used it as a spare compression gauge at my second shop since I can’t have my brand name gauge in both shops. Sadly it will be junked at this point unless the seller will refund me something or accept a return.Please do yourself a favor and buy a much better quality name brand tester even if it means spending significantly more money. What’s the point of using a product that may show you that you have a dead or dying cylinder when in reality it’s fine or acceptable and or shows a good cylinder or acceptable reading on one and in reality it has Cracked rings, cracked piston or gouged sleeves/bores, (see pic attached)!! This gave an acceptable reading which is clearly not possible so the gauge is junk.Please see the picture attached!This cylinder and piston showed 100 psi within acceptable specs for the Allis Chalmers engine I was working on. I knew something was up when all 4 cylinders showed the same reading. In my 30 plus year of professional and hobby small engine/ agriculture mechanic career I have never had all 4 cylinders show the exact same reading, and then another reading 30-50% different on the next test. Very defective item. If you see that picture that piston and bore should have a reading of 0psi and nothing more, period!please find my review helpful if it was, one mechanic trying to help another.Thank you.
Chris Tempero
2025-06-13 14:53:51
I got this to test out my compression on my moped engines. It worked great. it was a bit hard to use in tight spaces but no more than any other tool would have been. Im happy with it.
Nate
2025-04-14 12:29:09
Purchased to test compression on my Yamaha Grizzly 350 AWD. Tried to use "free rental" from all local auto parts shops, and their adapters did not fit. Go figure... I don't really need a compression tool often, but this fit perfectly. I have since had need to test generator and power washer compression - easy peasy with this.
Brad Sanford
2025-03-23 19:01:51
It’s. Not a snap on but it works
Customer
2025-03-12 10:59:26
Works . Nice box. Should last a life time testing compression once in a blue moon
Brian
2025-02-04 12:56:38
Used it a few times now. Seems to work fine. Nice threads.
Cliente de
2025-01-14 11:55:49
buen producto, en cuanto a calidad, es aceptable, recomiendo el kit, ademas de estar en un precio aceptable.
Satisfied customer
2025-01-13 14:23:30
Good product fast delivery
Francois Fournier
2025-01-10 14:27:58
The absence of a check-valve at the engine end adds the tube internal volume to the combustion chamber volume and generates lower-pressure readings. Really bad for engines with small combustion chambers.It gets even worse when used with an extension for those hard-to-reach areas since the internal extension volume also adds up. In that case, results are horrific.
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