yinmik 7 in 1 chlorine meter digital chlorine ph tester salt ph meter for saltwater pool ph conductivity for hydroponic drink water tds meter yinmik ph chlorine salinity ec tds orp temp reader for aquarium blue ph meter is up for auction in Patio, Lawn & Garden. The current bid is $1.00, 97% below the $39.99 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.