tested this and hardness was accurate for my area. I also tested a friend's salt water tank. that changed the reading and it never recovered to the correct reading for my local area. slightly off. I'lll have to see if the salt damaged the probes somewhat.
- How did the color on site compare with the actual product? correct
- Please tell us about the quality of the product. very good
- How accurate was the on site description of the product? accurate