pH Chlorine Meter Digital Salinity pH Tester for Saltwater Pool Salt Reader for Fish Tank Koi Pond TDS Test Pen All in One pH CL Salt ORP EC TDS Temp Monitor Hydroponic pH Conductivity PPM Tester VOLDAX as well as outdoor porches

as well as outdoor porches

screw hole center to center 4

Brand: RoskDeewat

【Size】Lamp body: 11

Due to the different manual measurement methods

pH Chlorine Meter Digital Salinity pH Tester for Saltwater Pool Salt Reader for Fish Tank Koi Pond TDS Test Pen All in One pH CL Salt ORP EC TDS Temp Monitor Hydroponic pH Conductivity PPM Tester VOLDAX as well as outdoor porchesBrand: YINMIK Features: [7 in 1 Water Quality Tester]: All in one pool tester test pH, residual chlorine, Salt, ORP, TDS, EC, and Temp at the same time. It is suitable for swimming pools, aquariums, hydroponics, drinking water, brewing. [Pool pH Free Chlorine Tester]: YINMIK pool water quality tester can accurately measure the pH, free chlorine level in swimming pool. The chlorine meter and pH monitor will help you keep pool healthy. [pH Salinity