A Tds Meter (Aka Ppm Pen, Food Tester, Tds Stick) Is an Inexpensive and Convenient Digital Tool to Instantly Control the Overall Water Quality. Tds = Total Dissolved Solids, Any Salt, Metal or Mineral Water. with the Push of a Button, Tds Can Tell You Your Overall Water Purity Level, Which Is Displayed on the Screen Ppm (Parts Per Million). the Lower Tds Level, Pure Water, Is 0 Ppm with Pure H2o. Tds Is a Tap to Control the Water Quality, or a Filter to Change the Time of Knowing. (The Meter Does Not Test for Biological Contaminants.) Tds Is a Great Tool for Drinking Water, Water Filtration and Purification, Colloidal Silver, Hydroponics (Test Nutrients), Aquariums, Ro / Di Systems, Pools and Spas, Commercial and Industrial Applications and More. Tds Is a Protective Carrying Case Containing a Rugged Model. This Is the World's Most Popular Handheld Tds Meter for Professionals in the Industry. Ts Ideal for Commercial Use Its Belt Clip with a Carrying Case Includes Function: Saves Your Measurements for Convenient Reading and Recording Due to Advanced Microprocessor Technology Built-In Digital Thermometer, Display: Large and Easy-To-Read Lcd Display. the Aqualutio Digital Tds Water Meter Is Ideal for Testing Applications Such as Hydroponics and Garden, Pools and Spas, Aquariums and Reef Tanks, Water Ionizers, Water Filter. Drinking Water and More. Tds Water Meter Ideal for Testing Applications Drinking Water, Water Filter, Carbon Filters, Spring Water, Hard Water, Average Tap Water, Refrigerator Water Filter, Water Filter, Brita Filter, Reverse Osmosis, Reverse Osmosis Filter Measures the Measurements of the Advanced Microprocessor Technology Built-In Digital Thermometer for High-Efficiency and Accurate Due to Convenient Reading and Recording, Display: Large and Easy-To-Read Lcd Display. the Aqualutio Digital Tds Water Meter Is Ideal for Testing Applications Such as Hydroponics and Garden, Pools and Spas, Aquariums and Reef Tanks, Water Ionizers, Water Filter. Drinking Water and More. Tds Water Meter Ideal for Testing Applications Drinking Water, Water Filter, Carbon Filters, Spring Water, Hard Water, Average Tap Water, Refrigerator Water Filter, Water Filter, Brita Filter, Reverse Osmosis, Reverse Osmosis Filter Measures the Measurements of the Advanced Microprocessor Technology Built-In Digital Thermometer for High-Efficiency and Accurate Due to Convenient Reading and Recording, Display: Large and Easy-To-Read Lcd Display. the Aqualutio Digital Tds Water Meter Is Ideal for Testing Applications Such as Hydroponics and Garden, Pools and Spas, Aquariums and Reef Tanks, Water Ionizers, Water Filter. Drinking Water and More. Tds Water Meter Ideal for Testing Applications Drinking Water, Water Filter, Carbon Filters, Spring Water, Hard Water, Average Tap Water, Refrigerator Water Filter, Water Filter, Brita Filter, Reverse Osmosis, Reverse Osmosis Filter Drinking Water and More. Tds Water Meter Ideal for Testing Applications Drinking Water, Water Filter, Carbon Filters, Spring Water, Hard Water, Average Tap Water, Refrigerator Water Filter, Water Filter, Brita Filter, Reverse Osmosis, Reverse Osmosis Filter Drinking Water and More. Tds Water Meter Ideal for Testing Applications Drinking Water, Water Filter, Carbon Filters, Spring Water, Hard Water, Average Tap Water, Refrigerator Water Filter, Water Filter, Brita Filter, Reverse Osmosis, Reverse Osmosis Filter