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HI-701 Free Chlorine Handheld Colorimeter - Checker®HC
Hanna Instruments (USA)Ideal for swimming pools, spas, and aquariums.
HI-98194 Multiparameter Waterproof Meter
Hanna Instruments (USA)The HI-98194 measures pH/mV, ORP, Conductivity, TDS, Resistivity, Salinity, Seawater, Dissolved Oxygen, Atmospheric Pressure and Temperature