In my shop I often have to check gaps. We have a set of pressure gauges in our factory for $600. you hate her. very rigid and uncomfortable for small gaps. I've been to the factory and used them and now everyone is asking me where to get them. Are they calibrated? no Will they be accepted by a major OEM? Depends on the OEM. Are they suitable for the daily inspections and are they cheap enough to make available to every inspector? Yes. I would highly recommend them if you are looking for quality test equipment.