Packed two cartons of WXJZ511 Mechanical Impurity Tester & WXSZ-402 Transformer Oil Acid Tester, and delivered to Iarq customer, thanks for your trust and support. WXJZ511 Mechanical Inpurity Tester suitable for the determination of mechanical impurities in petroleum products and additives. It can also be used as a constant temperature water bath. WXSZ-402 Transformer Oil Acid Tester, The instrument will automatically search the samples, inject the extraction, make a blank titration, do an experiment, clean off, display printing results and other operations as long as the operator put the sample cups in the sample cup holes and inject the extraction in the cup.