ATP-Low-Range-Pocket-Tds-Meter-TDS-5032-ATP-TDS-5032-P-A-TDS-Meter-indicates-the-Total-Dissolved-Solids-TDS-of-a-solution-i-e-the-concentration-of-dissolved-solids-in-it-P-P-This-ATP-TDS-5032-High-Range-Pocket-Tds-Meter-is-easy-to-use-giving-fast-accurate-&-repeatable-measurement-of-TDS-values-P-P-The-ATP-TDS-5032-is-ideal-for-all-water-quality-testing-water-purification-applications-wastewater-regulation-aquaculture-hydroponics-colloidal-silver-labs-&-scientific-testing