Remove knob by counter-clockwise rotation, simultaneously, pull away from body.
逆时针方向旋转拆卸旋钮，同时将其拉出阀体。
When the tester is used, the counter weight can be just sheathed with a small ring of a pull handle of the tester again, and the operation is simple, convenient and quick.
在要使用测定器时，重锤可套回测定器的拉手小环 即可，操作简单方便快捷。
When the tester is used, the counter weight can be just sheathed with a small ring of a pull handle of the tester again, and the operation is simple, convenient and quick.
在要使用测定器时，重锤可套回测定器的拉手小环 即可，操作简单方便快捷。
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