Accurate and Reliable Water Quality Tester Pen
#NN4390

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The meter tester can be used in: water purifiers and filters,drink quality monitoring, pools and spas, aquariums, hydroponics etc.
This pen has a total of four different modes, just hold down the SHIFT key, you can switch between different modes, mode memory function, each startup default to the last use of the mode before shutdown.
Applicable industries: water laboratories, CDC, the aquaculture industry, hospitals, swimming pools, household tap water quality testing."