Review on 📏 MMTR 04 Micrometer Graduation by Clockwise Tools by John Murphy

As an amateur geologist, I use this to measure thin sections of minerals mounted on a glass slide. The mineral thickness I'm looking for is 0.001 inch or 25 microns. This is the most economical micrometer I've had the chance to work with. Since I don't need thickness accuracy, but the difference between mineral + glue + foil and mineral thickness, your tool is perfectly adequate.