Delivery of these probes was very fast. I received them in the mail the next day. They were well packaged and oiled to keep them from rusting. To the eye, they look like high quality sensors. I didn't get them because I'm a locksmith in the tool and mold department. I work in industrial maintenance, so I don't do a lot of turning or milling. What we end up doing is lots of brass bushings and oil groove guides, among other things. Some other measurements I need to take are the brakes on the motors. The brakes on the motors must be set to the specified clearance with a feeler gauge. They'll work for what I need them for because I don't have to be accurate to hundred-thousandths. For those who need to be precise, you might not like this and they won't work if you measure in millimeters. That's not correct at all. They are close in inches and some are exact. When it comes to measuring mm, they're off. You can see what measurements I got in my attached photos. My microphones that I use are calibrated annually and were calibrated last month. They work for spark plugs and such, but you only have to spend a few bucks more for machining and use whatever name mechanics trust most and you know who I'm talking about. I don't know if I'm allowed to say her name here. All in all, I would not recommend these probes. You are not accurate.