yinmik 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 is up for auction in Patio, Lawn & Garden. The current bid is $4.00, 90% below the $39.99 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.