Review on 🔬 Measuring Mohs Hardness Kit Specimens by Loren Schmidt

I like the hardness numbers on the samples with a corresponding table what the sample is. There was relatively little corundum, but it's the hardest, so not much of it is needed. I'd recommend putting a durometer number on it to keep a few sticky dot markers from getting tangled. A great gift for a climber interested in specimen identification. I have used it several times to determine the hardness of samples.