[Canadian]

This is the exact same resolution and measurement error as the more expensive unit. I've always found it funny that people have used them and touted them as the "holy grail" for phosphate testing and now people are claiming the measurement error is too high on this one. Evidently they weren't paying attention to the literature on their pricier model. The resolution of 0.01 and measurement error of 0.04 is totally reasonable. What it means is that you can only reasonably assume your phosphate is somewhere between 0.00 and 0.04 when you get a reading of 0.00. When you get a reading of 0.03 (typical targeted value) you can only assume you're somewhere between 0.07 and 0.00. If you have a reading of 0.10 then you can reasonably assume you're somewhere between 0.14 and 0.06.