Super accurate if you follow directions By Old Salt on 12/1/2014
Old Salt would recommend this product to a friend
Testing for calcium is not as easy as testing for alkalinity or phosphates with the Hanna checker. But it's not brain surgery either. The keys are to get the right amount of the first reagent (1 mil) and the right amount of tank water (a minuscule .1 mil--maybe two drops or so from the syringe). It also helps to cut the packet of the second reagent down two sides and form a funnel (as shown in the Hanna video about the checker) so that it goes easily into the curvette. I find this process MUCH easier than counting drops and trying to read the the level of the syringe on my Salifert kit. You do need RODI water, but most of us have that around in one form or another. From what I can tell by cross-checking with Salifert, the Hanna test is spot on and far easier to read. Just take your time and follow the directions.
Inconsistent readings By Motti on 11/23/2014
Motti wouldn't recommend this product to a friend
Bought this test kit about a month ago, used is several times and assumed the readings were correct. Last night I tested again for the week and had 100ppm more than what I had a week ago. Nothing was added to the system in the meantime. So I went ahead and did two more tests on the same sample water, and which one gave me different reading.
It's possible that I am doing something wrong, but I found out I am not the only one who had that issue with the meter.
Great purchase if you take the time to use correctly. By Corey on 10/24/2014
Corey would recommend this product to a friend
Like others have said, you need to be precise when measuring the reagent and tank water to get accurate results. Because a colorimeter compares the amount of light that passes through the sample to the amount of light that passes through the blank (the cuvette with RODI water and first reagent) to calculate concentration, the cuvette needs to be free of fingerprints and smudges; using a soft, lint-free cloth works great. Also, the cuvette should be placed in the instrument with the same orientation every time to negate inconsistencies with the cuvette and give accurate results. I always have the 10 mL label facing the front, consistency is key. With proper use, this instrument can be a valuable tool.
Waste of Money By RSeahorse on 10/24/2014
RSeahorse wouldn't recommend this product to a friend
It's readings are all over the board. I don't trust it and have gone back to my Salifert test kit.
Accurate but a serious PITA By Greg on 9/22/2014
Greg wouldn't recommend this product to a friend
I found the results accurate assuming you took maximum time and effort into running the test. Quite frankly its just too much of a PITA to do regularly. I find the Red Sea test just as accurate and takes such a shorter time to perform. If they simplified the reagent process it might be fine but having to collect multiple water sources as well as the packets of reagent being a pain just put me in the negative column for this one.
Excellent By reefer dog on 9/9/2014
reefer dog would recommend this product to a friend
After reading through the many reviews of this product, I was a bit afraid of trying this product due to the reviews saying it was not accurate.
I disagreed totally. You just need to take your time and be accurate with your measurements.
From the very first time I have use this Checker, its readings are within a few numbers of my Red Sea system I was using previously.
Only used a few times By David on 7/30/2014
David would recommend this product to a friend
I just got this checker and so far I've only used it a few times. it was easy to use (no more counting drops) with a little practice it should become second nature to do it. the first few times it takes time just cause you aren't used to it (but that goes with anything else you do). I am a little concerned as to how many test I can get out of the reagents that came with the kit but for now I am good so that bridge will get crossed when it reached.
JUNK By Adam TJ on 7/17/2014
Adam TJ wouldn't recommend this product to a friend
This is the WORST tester I have ever used. It's sad they put Hanna name on it. It reads 540+ when my calcium was under 300 (because I kept turning my dosing pump down then off). The instructions are clear and easy to read use RODI, reagent, and tank water in said order; bla bla bla.
I wish some one would give me $20 bucks for it only used it 3 time now I use Red Sea and love it. Salifert is ok too.
Varied results also By stream on 7/10/2014
stream wouldn't recommend this product to a friend
Same issue here with the varied results.. Not sure I can know its accurate.
Accurate results with patience. By Chris on 5/9/2014
Chris would recommend this product to a friend
I have been using this tester along with my salifert test kit and the results are spot on if you are precise with the way you do the test. Any deviation from sample and regent measurements and this test will be thrown off into left field. I have compared the results of this tester with the salifert test kit and it is very accurate. I recommend this product to anyone who takes there time testing, if you like to fly through your tests then do not purchase this product. Also you need to use RODI water for your calibration, so with that being said if your RO system has depleted carbon blocks and filters then forget it. Great product!!!!
East testing By Charles on 4/26/2014
Charles would recommend this product to a friend
I have been using the Hanna checker for 3 months now. I don't think I could ever go back to any other type of test kits. I love the repeat illite of the test results. This is the second of 3 testers I have bought.
Not accurate By Zach on 4/6/2014
Zach wouldn't recommend this product to a friend
I tried this one for some time. Never had accurate or consistent readings. A little surprising because the phosphate checker and alk checker work great and are highly recommended. I use those weekly with great results. They need to go back to work and improve the cal checker.
Varied Results By Andrew on 3/28/2014
Andrew would recommend this product to a friend
I tested my water 10 times within a 1 hour period and literally had 10 different results. The range was from 400 ppm to 600 ppm. I then tested a known calcium level in my Reef Crystal Pro salt mix at 1.025 which ranges from 455-475 at that salinity level. The results were varied as well, from 420ppm to 500ppm (3 tests) The idea is nice but the execution is lacking. I followed the instructions exactly and used the exact amount of tank water. Watched the videos to ensure I was doing it right.
Great idea, poor results By Led on 3/27/2014
Led wouldn't recommend this product to a friend
I agree with others, it is all over the place.I have had mine for six months and have tried a new reagent and still no consistency.
Okay By sh55 on 3/10/2014
sh55 wouldn't recommend this product to a friend
Results are varied, I am not able to get a stable result and when compared to my Salifert Ca kit this kit reads 30-50 points higher.
I recommend watching the video Hanna posted on Youtube for more precise instructions and pointers.
When the instructions tell you to add .1ml of the sample, it is referring to your tank water not the mix in the cuvet or RODI.
Buyer beware not accurate By Rolando on 3/1/2014
Rolando wouldn't recommend this product to a friend
This product in my option should not be on the market until it is improved, just took three reading of the same water sample first 381 ppm second 449ppm third 495ppm using the same method, I have the Havana alk tester it's great, also the phosphate it's also very good. But don't spend your cash on the calcium tester if you do you'll be sorry you did.
Never the same result twice By Todd on 1/26/2014
Todd wouldn't recommend this product to a friend
directions are a bit complicated (compared to other Hanna checkers) and it seems that I never get the same result twice. I have gone back to my previous CA test kit.
Good product By Keith on 1/14/2014
Keith would recommend this product to a friend
Too many steps involved for my liking and doesn't always seem accurate but overall I think it's better than most other tests.
7 out of 10 By Jordo on 12/8/2013
Jordo would recommend this product to a friend
This isn't what you would expect from Hanna. The read out is great to have but the directions are a bit complicated. As a Nurse I am very used to small dose syringes and using precise lab equipment and this is kind of a pain for me. I have tried 3 tests on the same sample of water and got 3 different reading approx 30-40 points off. I'm still getting used to this test so maybe It will get better. I am a little disappointed =(
Improving Ca test precision By Bob on 12/8/2013
Bob would recommend this product to a friend
I purchased recently and like the digital readout but was a little concerned about accuracy and precision, primarily due to difficulty in accurately delivering a very small sample size (0.1 ml). I have made some suggestions to Hanna but in the meantime have revised my test procedure which seems to give me more precise results.
One possible solution would be to use a 0.1 ml syringe, however, these are fairly expensive and fragile. Alternatively, I revised my procedure as follows:
Instead of initially filling the cuvette to 10 ml with RO/DI water, I fill to 8.5 ml after adding 1 ml Reagent A and then press Add C2 on the meter.
To obtain the 0.1 ml sample I add exactly 1.0 ml sample to a clean cuvette and dilute to 10 ml with RO/DI water. I cap and invert 3-5 times. Then I take exactly 1.0 ml of this diluted sample and add it to the test cuvette. Then I finish filling to the 10 ml mark with RO/DI water and then add Reagent B and proceed as usual. This results in a more accurate delivery of 0.1 ml of sample.
The reproducibility and accuracy of the resulting readings are much improved.
Much better with improved reagents By Matt on 10/5/2013
Matt would recommend this product to a friend
I'd been getting variable results, but I found a post that said they had reformulated the reagents to improve the precision. I contacted Hanna and they sent me replacement reagents (and noted that they had recalled the old ones from retailers).
So, I'm getting much better readings now than I was before and if you've written it off, you may want to try it again with new reagents.
Good idea, bad instructions!! By Jason on 4/18/2013
Jason wouldn't recommend this product to a friend
I love the idea of a digital cal. checker.
However, after following the instructions in detail I could not get a good reading.
Had to go to the internet to find out what the problem was.
YOU MUST USE DISTILLED WATER WITH THIS TESTER TO MAKE IT WORK!!!!!!
Checker is inaccurate due to being overly complex and requiring absolutely pure RO/DI By Adam on 4/16/2013
Adam wouldn't recommend this product to a friend
I have had this checker for close to a year now and have finally completely given up on it. It was a waste not only on the checker itself but also on the $20 reagent packs. I have never gotten the same value twice from it. Using the same RO/DI water and sample water. I follow the exact same test procedure every time. My Hanna alk checker gives the same number on repeat tests and is invaluable. But the Ca checker seems to just randomly choose a number. This i believe is due to the 1/10 ratio being used. Perhaps the checker would operate correctly if i used lab grade RO/DI but i am unwilling at this point to spend another cent on it.
Great Product By Mark on 3/9/2013
Mark would recommend this product to a friend
Anything that makes testing easier is for me. I would absolutely recommend this product. I am not good at titration and can never tell when the end color is reached. This is a must for testing.