truTDS Pro Digital TDS Meter, Water Quality Tester w/ Temp Probe, Easy To Use, Quick 10 Second Results, High Accuracy, Pocket Size, Best For Testing: Drinking Water,Aquariums,Hydroponics,Filter Check PROTECT YOUR FAMILY'S HEALTH by Instantly knowing your overall drinking water purity level, The lower the TDS reading, the purer your water. With the Starden truTDS meter all it takes is 15 seconds for you to QUICKLY VERIFY that your Well, Bottled or Tap Water is safe to drink. POCKET SIZE DESIGN allows you to take the meter with you on your vacations, camping trips or even to the restuarant. You'll never be unsure of your water quality again. EASILY MONITOR WATER FILTER PERFORMANCE: Quickly know when your home, refrigerator, pool or aquarium filters are starting to fail. HIGH ACCURACY: Factory Calibrated for ppm accuracy +/- 2%. In just 10 seconds you'll answers the question: IS MY WATER SAFE TO CONSUME? MUST HAVE SURVIVAL TOOL: Always know that your WATER SOURCE IS SAFE for consumption no mater where it comes from. An essential tool for your prepping supplies. Buy with confidence, all Starden products are backed by a 100% MONEY BACK GUARANTEE