eztoch pool salinity ph tester hydrogen water tester, 7 in 1 ph salt orp h2 tds ec temp meter for salt water pool, hydrogen tds ppm tester for drinking water, ph ec orp meter for hydroponic water is up for auction in Patio, Lawn & Garden. The current bid is $2.50, 94% below the $39.99 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.