TSUBOSAN Japan-Hardness Tester Checker File HRC40-HRC65 Set of 6

Definitely an ultra valuable tool. Being able to test the hardness of parts quickly and cheaply is invaluable for creating a performance profile of a part. So far it seems on point when used correctly. The parts I know the heat treat of came in right where they should.If you need high precision then you need the expensive tools. But for 99% of us in the real world this is accurate enough.Awesome gift for the engineer in your life, they will get a kick out of having a field test kit like this to test metals etc

The files and case are well made

This seems to be the standard for testing aside from a $1200 machine. They feel nice and do what they say.

These hardness testing files are perfect for double checking the heat treatment on hardened steel. They're not accurate enough to generate a report or certification, but you can get close enough for something like a knife or a tempered part, or tell if something was overheated and lost its temper.The results are very dependant on feel and part surface finish, so don't trust your eyes and watch a couple of videos before you use them.

I already have a hardness tester, however I manufacture parts and tools that are impossible to test using it. That’s where these files come into place. They are easy to use plus they have a curved end for getting into awkward spots. Couldn’t do without them.

Works well for what is intended. Much less cost than an actual hardness testing machine of course, but ideal for those that can't afford the price or inconvenience.

Tested my knives immediately, these work perfect! All of the knives were within range for the type of steel I used. These files will be great for future heat treatments!

Given how expensive it is to buy a proper hardness tester these files are cheap. They will give you a good idea of how hard a material is but don't expect to get an actual number. You get a range. How well you understand the use of the files and the material you're testing will determine how small of a range that will be. At best it's about +/- 1.5 HRC. I have tested some materials where the best I could do was "somewhere between 45 and 55".Be honest with yourself about what these tools can do and you will be happy with them.