PH精密试纸
规格型号 3.8--5.4★5.5--9.0★6.4--8.0 产品包装 本产品采用无毒透明PVC盒包装,50本/盒,20盒/箱 产品描述 PH精密试纸主要用于化学试验中测定PH值用 使用说明
Bottle Cap Screw RIng Polypro 38mm
Cap Screw Ring for bottles with a 38 mm cap. This Screw Ring is made of Polypro and has a Stainless Steel Band to keep t