yinmik ph salt meter 5 in 1 ph tds ec salinity tester for pool spa aquarium hydroponic saltwater digital ph and ppm tester for household drinking water hot tub home brewing fish tank... 5 in 1 blue color is up for auction in Patio, Lawn & Garden. The current bid is $1.00, 96% below the $22.99 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.