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

I missed the "Batteries: Requires 2 non-standard batteries (included)" information. You cannot replace the batteries because even if you receive some of these "non-standard" batteries, you cannot open the device to change the batteries. I bought it about 4 years ago and used it 3-4 times, last one year ago. Now that I've taken it out of storage to use it, it's dead. How accurate that is, I have no idea. I just used it right out of the box and it seemed to work showing that my purification unit had removed about 95% of the dissolved minerals. I went back to the market to buy another device but it definitely won't be that brand.