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特点：
温漂少，稳定性好
Temperature drift less, good stability
铝合金拉伸型材外壳，形变小
Aluminium alloy strech cover,deformation small
电压、电流，422通讯输出
Voltage, current，422 communication output
红外光发射与接收，不受外界光干扰
Infrared emission and reception,no affection from out light.
线性好，分辨率高
Good linear,high resolution
