Bob Lee recently gave an e-mail address for the TDS-1 and there have been some discussion recently regarding results. I became interested enough to decide to buy one and found Hanna Instruments on the web. For those interested, the TDS-1 is for sale for $14.90. For details, check the following URL: http://www.hannainst.com/info/tdspromo.htm
The following is text copied from that page: After 10 years from its introduction Hanna proudly offers TDS 1 at $ 14.90. Housed in waterproof ABS case, this pocket-sized Total Dissolved Solids tester is very durable. It is the ideal meter for fish farming, agriculture, plating, water purification and other applications with high humidity levels. Wide Measurement Range TDS1 = 1 to 999 ppm Excellent Accuracy + 2% Full Scale Long Battery Life more than 1000 measurements One-Point Calibration ATC
