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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| JJG 991-2004 |
Verification Regulation of Aural Impedance Audiometers 阻抗听力计检定规程 |
China Metrological
Standards Impedance meter |
 English PDF |
| JJG(QB)76-1991 |
(SCI. 327 quartz crystal Impedance meter SPM. 327PPM counter test procedures) |
China Metrological
Standards Impedance meter |
English PDF |
| JJG(QJ)42-1987 |
(Impedance meter verification procedures) |
China Metrological
Standards Impedance meter |
English PDF |
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