1. Tooth gauge
A tooth gauge is used to experience the quality of the thread and is manufactured according to national standards. It has external and internal threads. External threads are understood as the standard for testing nuts. Internal threads can be used as a standard for testing nuts.
2. Needle detector
The needle detector is the standard for checking bores. Generally speaking, there are two kinds, one is a general meter and the other is a stopped meter. Just like metal rods, normal gauges can fit in holes, but stop gauges cannot. Either of these two errors means that the size of the product is not up to standard.
3. Vernier caliper
A vernier caliper is a measuring tool for measuring length, inner diameter, outer diameter, and depth. The vernier caliper consists of a main scale and a sliding vernier connected to the main scale. The main ruler is usually measured in millimeters, while the vernier has 10, 20, or 50 graduations.
Vernier calipers can be divided into 10-degree vernier calipers, 20-degree vernier calipers, 50-degree vernier calipers, etc. The vernier has 9 mm 10 scale, 19 mm 20 scale, 49 mm 50 scale. There are two pairs of movable measuring claws on the main ruler and the vernier of the vernier caliper, namely the inner measuring claw and the outer measuring claw. The inner jaw is usually used to measure the inner diameter, and the outer jaw is usually used to measure the length and outer diameter.
4, Micron
Micrometers and vernier calipers are used to check external inspection, internal diameter and depth, but they are relatively single. Buy a different micrometer for each size, such as an outer micrometer and an inner micrometer.
5. Altimeter
Altimeters are used to measure the depth dimension of a product, such as from one end face to the other.