Pure Water Test ( PWT) enables users to check the purity of your distilled or demineralized water in laboratory or industrial environments. PWT is suited for fields such as printed circuit board washing, laundry, steam cleaning, checking car battery water and all areas where distilled, demineralized or pure water is used. This tester is housed in a durable case that provides excellent protection against harsh industrial environments. Order Information: HI 98308 ( PWT) is supplied with protective cap, calibration screwdriver, batteries and instructions.