Not worth buying By Joshua on 10/13/2016
Joshua wouldn't recommend this product to a friend
I have a couple other Hannah checkers which work flawlessly the precise they're accurate and you can check them against other test kits with out any difference you can repeat the tests and get for the most part the same exact numbers however ....
I'm a medical professional I know how to draw up exact amounts of fluids and titrate I have followed the Hannah directions for the calcium meter exactly to a T and I cannot get the meter to reproduce The same test values ever . I took a sample of water and a clean sterile syringe filled up Both cravats and ran the test twice each one when compared to the Red Sea pro said the calcium was somewhere between 50 and 75 ppm higher than what the Red Sea showed . If it was five or 10 ppm that's not a big deal I could live with that but 50 or 75 ppm could theoretically mean the death of prized corals or the starvation of prize corals that I have worked very hard to keep alive.
That being said if you're looking at other Hannah checkers bite the bullet because they're worth it but I would steer clear of the calcium and a checker and use a traditional titration such as the Red Sea, Nyosor even an API kit .
don't trust this checker By jason on 9/29/2016
jason wouldn't recommend this product to a friend
i do not dose my tank at all this checker one day give me 380 reading the next day give me 530 the third day 460 i m going crazy with this thing do not buy it
Works as advertised By Josh on 9/17/2016
Josh would recommend this product to a friend
I haven’t run into any of the issues the others have. I can perform this test in a couple of min. and it’s accurate. I’ve compared it to other tests (even Triton Labs) and it has been within a few points. I’ve also have not seen inconsistencies between tests.
I prefer this much more than trying to read colors
Not accurate By Mark on 8/29/2016
Mark wouldn't recommend this product to a friend
This test takes almost as long as using titration via Red Sea's test and seems to read higher than Red Sea (60-80ppm higher). The sample size of tank water 0.1ml is way to small. if your off by a drop, your readings are skewed. I love their Alkalinity checker though!!!
Different results, same water, minutes apart By virginia on 8/27/2016
virginia wouldn't recommend this product to a friend
Results extremely high, retested for accuracy, got different high readings everytime. Not what I was expecting from a digital test. Was expecting to trust digital reading, not if the same water has different results from testing and retesting for accuracy and extremely high numbers in the 500
Very inconsistent readings render this checker useless. By John on 8/17/2016
John wouldn't recommend this product to a friend
I use quality ro/di water (with 0 tds) and am very meticulous in the testing process. I have been wondering why I was having difficulty stabilizing the calcium levels in my tank. Today, I decided to repeat the testing to insure consistency. Three identical tests within 15 minutes yielded calcium levels of 334, 496 and 429. Problem solved - These wildly varying results are completely unaccepable and render the checker useless. Called Hanna and they want me to use their DI water for testing and are sending a "more accurate" syringe....
What junk By Mikey on 7/19/2016
Mikey wouldn't recommend this product to a friend
Can not get two results within 75-100 ppm. Contacted Hanna, we will see if they will back their product. It must be defective? I don't believe I'm that stupid or am I????
While I would recommend this checker it is much more cumbersome than the alkalinity checker By Chris on 6/23/2016
Chris would recommend this product to a friend
Since this checker requires dilution and two reagents its much more difficult than the ultra simple alkalinity checker. One of the biggest issues is the powder reagent. you have to cut 3/4 of the packet and bend it in a certain way to make sure the entire contents come out into the test vial without spilling. there have been a number of times where I spilled some and rather than risking a bad reading I just started over.
Bottom line, I want speed and accuracy. This fails on both By Ryan on 6/14/2016
Ryan wouldn't recommend this product to a friend
Fact is there are much easier Calcium test on the market. I was hoping for the same ease of use as the Alk and this test let me down. Too many variables to screw up if not exactly precise. The packets of reagent are annoying. Bottom line, it's a slow test, easy to get a bad reading and for $50 fell terrible short. I can use the API test and get my Calcium reading in 2 min for half the price. I will not use this test kit again.
Hanna By Robert on 6/1/2016
Robert would recommend this product to a friend
I have read the reviews here and I think a lot of the bad reviews is operator error, if you take the time to make sure the testing vile is cleaned out every time and rinsed with RODI water, and testing is done with good RODI water you will find this kit works well!