。 测量内径，外径，深度和步骤的四种功能。

2.采用不锈钢材料，防锈性能

3.指示灯双向地震

4.金属壳具有防止铁的功能

5.旋转拨号零，然后锁定

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. Four functions of measuring inner diameter, outer diameter, depth and step.

2. Made of stainless steel material, anti-rust performance

3. Indicator bidirectional earthquake

4. The metal shell has the function of preventing iron

5. Rotary dial zero, then lock

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