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Digital TDS Water Quality Tester
ShopHDE has the Digital TDS (Total Dissolved Solids) Water Quality Tester for $17 - $6 off with coupon code benmar127r6 [Exp 4/6, 100 uses] = $11 with free shipping. Features 0-5000 ppm measurement range, digital calibration, and also measures temperature. All orders ship free from U.S. warehouse.
