One cylinder tells you nothing; the spread tells you everything · review
The cheapest complete petrol kit here, and it includes the two rubber cone ends that let you take a reading without threading anything into the head.
The last word A complete petrol kit at the price of a spark plug set. It measures; the manual interprets.
A dial gauge, a hose, four threaded adapters and two rubber cone ends, in a case.
A compression tester is only as useful as its ability to seal in your plug hole. M10 through M18 covers most petrol engines; a recessed plug on a modern head also needs enough reach, and that is worth checking against your engine before ordering.
A quick comparative check without threading an adapter into every cylinder. Held against the plug hole, they give a reading good enough to compare cylinders — which is the whole purpose.
Never as a single number. The spread between cylinders is the measurement, and both the expected value and the permitted difference are published by the engine manufacturer.
On sale at around $17 on the American Amazon store at the time of checking.
Prices and availability are what Keepa reported on the date this page was updated; both move.
Prices quoted in this text were read on 4 September 2026. The live price is at the top of the page.
| Engine type | Petrol, stated |
|---|---|
| Gauge | 7.6 cm (3 in) dial, dual scale 0–300 psi and 0–20 bar, stated |
| Thread adapters | M10, M12, M14, M18 with O-rings, stated |
| Quick check | Two rubber cone ends for readings without threading in, stated |
| Stated coverage | Adapters for a range of vehicles and plug depths |
| Amazon reference | B07BKWPPDR |
| EAN | 0737123870622 |
They are for comparison, which is what a compression test is. Held firmly against the plug hole they give repeatable readings; threaded adapters are more consistent and slower.
The manufacturer of your engine publishes both the value and the permitted difference between cylinders. This site does not quote either — the number that matters is the spread, and the tolerance is per engine.
7.5/ 10
A complete petrol kit at the price of a spark plug set. It measures; the manual interprets.
A reference exists on these Amazon stores: France, Germany, Italy, Spain, United Kingdom, United States. Listed is not the same as in stock — availability changes daily.
Details checked on September 4, 2026.
A first compression test on a petrol engine, where the spread between cylinders is the answer.
Amazon reports what buyers took in the month before this page was last checked: at least 500.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Specifications: the manufacturer sheet for garage tools and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
Petrol · 0–300 psi / 0–20 kg (0 to 44.1 lb)/cm² · 4 thread adapters including M10 for motorcycles · 2 rubber cones
A petrol kit whose listing names the M10 adapter as the motorcycle size — a small honesty that tells you the maker knows what the set is used for.
Best for: A household with a car and a motorcycle, where one kit should cover both.
Petrol · analog dial 0–20 bar / 0–300 psi / 0–2000 kPa · adapter hose or rubber cone tube · M10–M18
The workshop-brand version: an analog dial with three scales, an adapter hose and a rubber cone tube, from a maker whose catalog numbers mean something.
Best for: Someone who expects to still own this in fifteen years.
≈ $105
Diesel · 0–70 bar / 1000 psi · 17-piece · rotating quick coupler · pressure release valve · copper and steel
The diesel kit, and the reason a petrol tester cannot be used on a diesel: 70 bar rather than 20, with injector and glow plug adapters instead of spark plug threads.
Best for: A diesel car, van or tractor — where a petrol gauge would read off the top of its scale.
