Stainless Steel Scissor Type Ruler Hat Caliper Ring Compass Cap Size Measuring Tool

Hat ruler, also known as inner diameter ruler/measuring cap. There are various sizes of hat rulers, including oversized sizes of 57-70cm, enlarged sizes of 55-68cm, medium sizes of 49-62cm, and small sizes of 42-52cm. The manufacturing material is stainless steel except for the outer ring and screws, and the rest is copper material, which is durable and rust free.

Instructions for Use
Firstly, place the ruler into the position of the sweatband on the hat, then pinch the handle of the ruler to expand the steel ring outward to support the sweatband. At this point, the size on the dial pointed by the pointer is the size of the hat
A is the American standard, CM is the metric system, F is the French standard, E is the British standard, and the most commonly used unit is the metric system (CM)

Precautions:
1. Do not store instruments near acidic or alkaline substances
2. Do not wash with water/try to avoid contact with liquids as much as possible
3. Do not let other items squeeze/handle gently
When there is an error, the two screws on the pointer should be slightly adjusted
5. When measuring a hat, place the ruler in the hat and gently unfold it to avoid excessive force.

Price is for 1 pcs. please choose the model you need.

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