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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.
$11
Also can be used for pregnancy testing.
this is 21 bucks @ amazon .. good deal for those wanting to monitor reverse osmosis filtering system, aquariums,tap water....heres amazon link to similar item.... http://www.amazon.com/HM-Digital-Pocket-TDS-4-Quality/dp/B0002T6L5M