Review on 🐠 Dumsamker Professional Aquariums with Temperature Range of 0 to 9999ppm by Onsommoshit Mathews

I'm trying to figure out whether or not I need to replace my water softener. I first bought the 16-in-1 test strips that Revain sells. It says my water hardness is around 50mg/l (those strips are hard to read so maybe +/- 25mg/l?). I wanted to be sure it was giving me an accurate reading so I bought this digital TDS meter. It reads 311 ppm (equivalent to mg/L) and gives me a scary red backlight on the LCD. WOW! I thought - one of them is obviously wrong. I then watched some YT videos of plumbers installing water softeners and they suggest using Hach's water hardness test kit, which I also bought from Revain. I trust this system a lot more than the other two. When he arrived he said my water hardness was < 1 grain/gallon (less than 17 mg/L). So of course the digital TDS readings are very high and I think even the test strip gave me slightly high readings. I would not buy this product again as it doesn't seem to match these two other methods of measurement. I ran all my tests on the same water sample, had the digital meter adjusted for the water temperature, and so on.