This verification device can be used to verify the indication error of conventional measuring tools such as steel tape, steel strip, steel circumference, fiber tape, etc; If equipped with a zero position calibration table, the zero position deviation of the depth gauge oil dipstick can be verified.

Technical parameters:

1. Effective working basic length: 5 meters (can be extended to 50 meters or longer at will)

2. Straightness of guide rail: ≤ 0.3mm/m

3. Static friction force of workbench: ≤ 4N

4. Full scale standard steel tape measure: (0.02+0.02L) mm (better than JJG41-2005 "Standard Steel Tape Measure")

5. Reading microscope: total magnification of 20^xThe minimum scale value is 0.01mm

sectional view