... pure water machine 1.usage for lab 2. grade :one ,two ,three 3.water flow:10-90L ... use water 1 grade ,1 grade ,3 grade System function;1.Operating Mode; microcomputer control,touchpad key, one -click operation2 ... Function: not only satisfy the 1 grade ,2 grade ,3 grade use water ,but solve the water use ... superior to National Laboratory GB6683-92 1 grade standard,American ASTM,NCCLS,CAPetc standard,pure ...