2PCS Metric & Imperial & US Screw Gauge SAE Whitworth 55 Degree & Metric 60 Degree & & US 60 Degree Thread Pitch Gauge for Industrial Measurement

good but not the best. works as it should, but it is stiff. out of country origin.

Great product, great price, great service

Almost 5*, but it skips over a few threads. (Eg it has 26G and 28G but not 27G)

It's accurate. Works as it should. No rust, cycles smoothly when searching through different sizes.

This is a great product

The product documentation is correct (or not wrong) but the technical terms are confusing because of the history of screw thread standards.Most USA users will want to measure Unified Thread Standard (UTS also known with more precision as UNC/UNF/UNEF course / fine / extra-fine), and this gauge set includes a *VERY SMALL SET* of these, in the middle tier of the device: just six of them, 8, 10, 11, 14, 19, 28 TPI (threads per inch). UTS threads have 60-degree angles and the standard combined and superseded USS ("coarse") and SAE ("fine") threads: the terms USS and SAE are still used informally, and they are valid in the sense that they refer to a subset of threads in the current UTS standard.This gauge includes a much wider set of metric gauges, labeled with decimal points, e.g., 0.25, 1.0, referring to metric thread pitches (these are 60-degree angles). In USA, one encounters metric fasteners pretty often, but not nearly as often as UTS fasteners.This gauge also includes a wider set of BSW (British Standard Whitworth) gauges, labeled with a TPI plus the suffix "G". British fasteners are uncommon in the US. These gauges have 55-degree angles. While they can be used to measure the TPI of the 60-degree UTS screws most common in the USA, they are harder to match, because they don't give you as clear a visual confirmation that the gauge fits the thread you are trying to determine.A well-made thread gauge this size is $40-$50. For the price, this is a fine gauge, if you understand its limited usefulness in the USA. The stamped labels are faint, hard to see, compared to a better gauge.

Works great would buy again.

I saw "Metric & Imperial" and thought, ok, there will be normal freedom units. But I also saw Whitworth and thought, why not, can't hurt. But I think that the "Imperial" the description refers to is the Whitworth form - which if you think about it is a threadform that is not metric, i.e. it is _one of_ the "imperial" threadforms. That's what you get: metric and British Standard Whitworth.With that out of the way, I'm the perfect customer for this product because I already own a couple of perfectly functional thread gauges for normal American 60deg teeth per inch. I only lacked the metric part. And since I had normal American units covered, it seemed fine to add exotic antique British threads to my capabilities. I think that this Whitworth form (the first standardized threadform I believe) would be useful if you were an antique restorer/collector. Old bicycles, engines, machine tools, etc. had these threads. I think you could use this to check normal American hardware store bolts for threads per inch, but I would be cautious about holding it up to the light and trying to match the exact thread shape.The metric side, the reason I bought it, seems good. I even liked the fact that they stamped the German word for "metric" - if you live in the USA, using metric is like taking a foreign vacation to a nice place anyway.Some people complained about the visibility of the markings. My eyesight is normally not great for stuff like this yet I can see the markings with out my normal magnifier just fine. They are not weakly printed but appear to be durably stamped.I checked an M4, M5, and M6 coarse threads and they all seemed exactly correct. I can't attest that all of the values are good, but these are the most common three I'm concerned about.For the price, this tool is a bargain.