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This bundle pairs the trusted HM Digital TDS-3 Handheld TDS Meter with the HM Digital C-342 NaCl 342 ppm Calibration Solution — giving you a complete

Accurate  ±2% Full Scale TDS

Total Dissolved Solids (TDS)

470 mV) recommended for optimal accuracy

HM Digital SM-1 In-Line TDS Monitor - Single Line Digital Water Quality Meter ORP electrode Did you KnowSM 1: In line Single TDS Monitor The SM 1 is provides an easy to read single line TDS monitor that provides a digital readout. It is ideal for any water filtration system, including reverse osmosis systems, coolers and much more. FEATURES: Displays TDS level of a single water line Efficient and accurate Auto Off function conserves battery power. (Shuts off automatically after 10 minutes of non use) Factory Calibrated: our meters are calibrated with a