These sensors meet my expectations for a basic set of sensors. Having tested about 50% of the blades with a micrometer I'm pretty sure they are accurate. There were a few things I didn't like, but you get that with any stylus in this price range. Here are the things I didn't like 1) Slightly more oily residue than I'd like (all import kits have this) -- You can just rub it lightly with a paper towel once, but make sure you don't get it wet or You will need light machine oil or 3-in-1 to recoat. 2) The outer cover/handle of the angled probes bends in a different place than the tentacles themselves. You can unscrew all the tentacles and bend them back with two needle nose pliers 3) You can't easily take it apart as there is no thumbscrew. It also seemed strange that the mother on the angle gauge is different than the others. What I liked: * Metric and standard readings on both gauges. So if you choose the wrong set, you can still get a fairly accurate reading for the other meter. the print was very good and legible* Non-angled styli are very compact.