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角(jiao)質(zhi)(zhi)(zhi)層(ceng)(ceng)(ceng)含(han)(han)水(shui)(shui)量(liang)反映了角(jiao)質(zhi)(zhi)(zhi)層(ceng)(ceng)(ceng)的生(sheng)理功(gong)能，正常(chang)情況下，角(jiao)質(zhi)(zhi)(zhi)層(ceng)(ceng)(ceng)中(zhong)的水(shui)(shui)是(shi)結合水(shui)(shui)，在含(han)(han)水(shui)(shui)量(liang)低（大約20%，W/W）時，角(jiao)質(zhi)(zhi)(zhi)層(ceng)(ceng)(ceng)中(zhong)的角(jiao)質(zhi)(zhi)(zhi)形(xing)(xing)成細胞(bao)并(bing)不隨水(shui)(shui)的增(zeng)多而(er)(er)膨脹；而(er)(er)在含(han)(han)水(shui)(shui)量(liang)高（大于(yu)57%，W/W）時，角(jiao)質(zhi)(zhi)(zhi)層(ceng)(ceng)(ceng)中(zhong)的角(jiao)質(zhi)(zhi)(zhi)形(xing)(xing)成細胞(bao)隨水(shui)(shui)的增(zeng)多而(er)(er)膨脹。ASA-M3/R皮膚角(jiao)質(zhi)(zhi)(zhi)層(ceng)(ceng)(ceng)含(han)(han)水(shui)(shui)量(liang)測試儀(yi)是(shi)基于(yu)電導法(fa)，利(li)用角(jiao)質(zhi)(zhi)(zhi)層(ceng)(ceng)(ceng)中(zhong)電解(jie)質(zhi)(zhi)(zhi)的導電性(xing)，當測試探頭與皮膚接(jie)觸后呈現出的與含(han)(han)水(shui)(shui)量(liang)相應(ying)的電導。