Very easy to use. The micrometer and wrench pouches contain a lot of packaging oil, so you'll need to wipe everything down before using it (be careful when using alcohol as the painted letters may stain the case). ). Instructions are not included, which may pose a problem for someone new to micrometers. If you heel the spindle too far when measuring, your reading may be 0.01mm less than it should be. stand back and sit more reasonably, the measurement will be accurate. I had to adjust mine as it was off by 0.03mm but the wrench did the job adequately. For the money this is a good little tool as long as you remember how fast you are spinning it. If that 0.01mm is really important to what you're doing, it might be worth considering a more accurate model.