Since the judgment accuracy of the inner diameter measurement was necessary in units of 0.05 mm, this pin gauge jumped 0.025 mm and conformed to the requirement. The price was reasonable and it became motivation for purchase. The size engraving is also clear and easy to use. It is a bad point to use a bit because it is necessary to pay attention to rust.
Although the case is resinous and has a good appearance, it is designed to fold back the lid to support the table at the time of inspection, but it is hard to use because there is no catch of the nail. I want some idea.