余氯测试盒(freeandtotalchlorine) Method:colorimetric,DPD,withcolour-diskcomparator0.25-0.50-0.75-1-2-4-7-10-15mg/lClMicroquant
面议
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余氯测试盒 (free and total chlorine) Method: colorimetric, DPD, with colour-disk comparator 0.25 - 0.50 - 0.75 - 1 - 2 - 4 -