Red SeaFish Pharm ARE21416 Reagent Magnesium Pro Refill Kit for Aquarium, 100 Tests

I have bought several different brands of magnesium test kits and I find this one the easiest to use. I cannot vouch for the accuracy because I have never compared it against another test kit, however I have not had any issue with my tanks concerning magnesium so I will continue to use this product.

Seems stable and consistent up to expiration. I got the 3 piece kit and then got this as I ran out. 5 Stars

Easy to use and I would have given a 5 stars if it did not arrived missing the instruction and guide. I am giving a 3 star because not only the magnesium pro test kit came without the manual but the calcium pro test kit also was also missing the instruction. I have to waste my time googling for instruction online every time I perform the test.

Does not come with an instruction card so keep your old one. I did recieve a new syringe. I use Red Sea test kits for Calcium and Magnesium, but I find the Alkalinity test to be very tricky to read. For KH/Alk, I find the Salifert brand test to be much easier to read.

Exactly as pictured. Arrived faster than expected. Thank you.

Great magnesium test kit . Reliable and consistent

I use and like just about everythin that red sea makes. Their test kits are very accurate if you use and read them right. Had to return this to get a refund. Package arrived in good condition. Open it to find that at some time, the inner bottle of liquid (the large one)had leaked out all of its contents. The box was dry, but it was crusted up and misshapen from the leaking fluid. Can't really be lived it was shipped in this condition

Excelente

Bottle of chemical arrived broken and empty. Had all spilled out. Item is useless. Thanks to Amazon for refunding the purchase