Hanna Instruments Hanna Marine Magnesium Checker HC HI783 Saltwater Aquariums, Marine, Aquaculture Applications Magnesium Tester 64 grams

This one was a little more involved than the alk, PO4 and NO3 checkers but still easy enough to use and great to have a number instead of guessing on standard tests. Helps to gauge when to add more Mg to the system.

easy to use

Worked great

I would give zero stars if I could. This is shameful... Basically useless. The first one I bought would read 1800+ regardless of what I put in the cuvette. RODI water, tank water, or freshly mixed salt water. I asked for a replacement since I thought the first one was defective. NOPE. Still getting 1800+ Mag on tank water, and freshly mixed saltwater. Very poorly performing test kit. DO NOT BUY.

Great Product

Works great and gives accurate reading.

Easy to use, consistent and accurate against ICP tests

The test is very easy to mess up, I never got accurate results (always hit the max of 1800) overall the idea is there and nice for a quick test if it’s accurate the first time. Other Hanna testers are good but not this one unfortunately

Nice

Love being able to take 5 minutes out of my day to do the test. One tip, set a 30 second timer or the last step and shake vigorously. Then pop into the egg and hold the button till the 3 min counter starts. After 1 min is left open the egg and pull the glass vial out and tilt back n forth to dislodge any bubbles on the glass then pop it back in before the timer ends. That way you'll get a very very close reading if not a perfect reading. This is the new revision and works extremely well..

ahora si da los parametros correctos y se actualizo el firmeware con un contador de 3 minutos para determinar el valor de magnesio

exelente