Review on 🧪 HM Digital TDS-4: Portable TDS Tester with Precision Measurement and Wide Range Accuracy by Travis Varner

people. This is an inexpensive plastic counter and should be treated with care. It's great for testing my watering solution in my hydroponic garden. The readings are very accurate (most of the time (90%) I would have to guess to within 2% accuracy (when testing on a more expensive lab model - I've worked in a chemistry lab for 40 years), it gets wet or gets some before use Minutes wet, and the calibration MUST be checked frequently, which is exactly what happens with these types of meters, the TDS meters I use in the chemistry lab cost hundreds of dollars, they're just slightly more accurate, just as fragile, and require frequent calibration. You cannot just keep this item in a drawer, pull it out and expect to use it immediately for accurate readings without proper preparation/maintenance Error.