The vernier card tape measure is a combination of a vernier caliper measuring head and a steel tape measuring tape. It has the measurement function of caliper, but it adopts the crimpable ruler body. On the basis of portable and light weight, it greatly expands the range of the caliper. It is a new type of measuring tool that fills the measurement gap of precision large size in the range of several meters. First, the structure A-type structure card tape measure is shown in Figure 1. The movable measuring claw 3 (fixed with the ruler) and the fixed measuring claw 4 with the common caliper ruler, the vernier sub-foot 5 mounted on the housing is calibrated with respect to the millimeter line on the tape, and the graduation value is 0.02. Mm.
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