??特点：
* 电感测量系统
* IP67防护等级，确保卡尺在恶劣的环境中也能可靠工作
* 3V锂电池，电池寿命＞1年
* 内置无线传输
Feature:* Inductive measurement system
* Protection grade IP67, ensure the caliper can work reliably in hard environment.
* 3V Lithium battery, battery life＞1 year
* Built in Wireless transmission
