Marine Lab Reef Multi-Test Kit - marine water test - Carbonate Hardness, Magnesium, Calcium and Phosphate

Calcium and magnesium tests are not accurate. Different results everytime and always high and off the scale compared to my redsea and Colombo test kits. I even tested a fresh salt mix and readings were still off the scale. Very disappointed as I thought I'd found a more reasonably priced option.

I have to agree these tests are very inaccurate. I won’t trust them.

Kh and Ca testsare useless,dont tell you your kh or ca unless its within a certain range. Very unaccurate for what I need.

Not one of the tests are accurate. Spent a lot of money trying to fix the parameters and was struggling to get anything within range. Eventually sent of samples of the water and found out the water wasn't the problem, the rest was the issue. Many other brands out there that are more accurate, both cheaper and more expensive.

Kh and Ca tests absolutely useless,dont tell you your kh or ca unless its within a certain range,what is the point?

I’ve used each test multiple times because of how wildly inaccurate the readings were, yet each time they were the same. I was getting calcium reading of 200 so I got an ICP test which revealed is was actually 435.

Not a very good product. There just is no range in the readings so unless your water is spot on it wont measure properly.had to go out and buy a well known branded one in the end.this 1 is going in the bin.waste of 50 quid