Not accurate By Zach on 4/6/14
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 3/28/14
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 3/27/14
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 3/10/14
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 3/2/14
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 1/26/14
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 1/14/14
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 12/8/13
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 12/8/13
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 10/5/13
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 4/18/13
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 4/16/13
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 3/9/13
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.
Complicated to use, but provides good accuracy By Miles on 2/13/13
Miles would recommend this product to a friend
This test took some practicing to get right. There are several steps involved in this test involving 2 separate reagents, RO water, and the sample. Ensure that the RO water you use in the first step is indeed at 0 TDS or you can very easily end up with an out of range reading (over 600). I was never good a titration in chemistry class, so this test while complicated gets rid of the frustration factor that comes with titration.
better than the alternatives, not as good as other hanna checkers By Gary on 2/3/13
Gary would recommend this product to a friend
You must have di water available, there are a lot of steps. Still better than the alternatives though.
I like Hanna Checkers, but the accuracy on this one doesn't seem up to par. By Chad on 12/15/12
Chad wouldn't recommend this product to a friend
I am a fan of Hanna Checkers, but my Calcium checker doesn't seem all that accurate. It is ~25-100 off from other test kits and I follow the directions meticulously.
Workd great for me By Dawn on 11/30/12
Dawn would recommend this product to a friend
I think it is a great tester!!! Mr saltwater tank recomends them tooo!!!!
Very handy By Aaron on 11/19/12
Aaron would recommend this product to a friend
I was hesitant about getting this tester as I have read some questionable reviews, but using it for almost six months now I love it. It is consistent, as long as it is used correctly with DI water. It is nice to read a number rather than judge a color.
seems to work By brad on 11/6/12
brad would recommend this product to a friend
i am happy with this checker went step by step and tested my water and showed 533ppm
Super easy By Rob on 10/3/12
Rob would recommend this product to a friend
Out of all the test I like this because u don't have to count drop by drop, super easy
Accurate if use good water By Edward on 9/29/12
Edward would recommend this product to a friend
So I knocked off a star because this should come with its own DI water (or BRS should sell the Hanna water). If you use the lab grade water, this thing is very accurate and easy to use. I can't say it is any better than Salifert, but having the digital readout is a plus. The one other thing I wish it came with was a little cloth to wipe the glass before putting it in the checker. I have one to clean glasses that I use and I think it would be easy to include that since the clarity makes a difference (same as all other Hanna Checkers).
Worked for me By MATTHEW on 9/24/12
MATTHEW would recommend this product to a friend
I found that I was getting accurate results if the directions were followed precisely. Not as easy to use as the alk tester.
Test Results way too high By Bob on 9/12/12
Bob wouldn't recommend this product to a friend
I've used this Ca Checker for several weeks now and can only conclude that it consistently measures the Ca concentration at least 100 ppm too high. I was really hopeful for this instrument but very disappointed. Going back to my Salifert kit that I can believe and trust.
Works for me By Christopher on 9/1/12
Christopher would recommend this product to a friend
I just got this the other night and although I will agree it is a bit hard to measure out some of the steps, it does work and the reading was up to par with my other test kit. Only time will tell.
Highly recommend. By BRIAN on 8/30/12
BRIAN would recommend this product to a friend
The Hanna calcium checker has worked great for me. I always get consistent results. It's simple to use with just a few steps to follow. No more trying to guess colors. Just make sure you have some fresh RO water on hand to use with the test.
Do Not Buy By Robert on 7/21/12
Robert wouldn't recommend this product to a friend
I cannot believe Bulk Reef Supplies sells this product. It is horribly inaccurate. I bought this tester and wish I did a search on the internet before I did. Like myself, many others find this tester to be a total waste of money. It simply does not give accurate measurements of your tanks Ca levels.
Not That Great.... By Derrick on 7/7/12
Derrick wouldn't recommend this product to a friend
So I have the phosphate and alkalinity checker from hanna and both are wonderful. Easy to use and accurate. The Calcium checker on the other hand is VERY difficult to use and usually the numbers are not even close. I think you need to have lab grade RO water and a specific instrument to measure the .1 ml of water. Hanna needs to make this easier to use somehow. My salifert and red sea test kits are so easy to use I would recommend those over this unit.
Terrible product By Francisco on 7/6/12
Francisco wouldn't recommend this product to a friend
Be smart, due diligence and read the reviews posted here. In its present state, this tester is not reliable enough to rely on. Distilled water?? Powder?? .1 ml ?? Go Salifert or Elos and be done with it.
Not so precise! By Benjamin on 6/18/12
Benjamin wouldn't recommend this product to a friend
Every time i test and retest using the same water sample I obtain different results.
Meh By Ben on 5/30/12
Ben wouldn't recommend this product to a friend
It's innaccurate. It works, but it's innaccurate. And I've done research in genetic labs, its NOT the user on this one...
Test kit By robert on 5/14/12
robert would recommend this product to a friend
With API test kit I got 420 with this 442 for the cost diffrence I would have stayed with the API kit,
Good kit, but very time consuming By Laura on 5/3/12
Laura would recommend this product to a friend
I found tat the API calcium test was less time consuming, and pretty effective. I won't reach for this kit as often as I thought I would.
Great tester, but testing is time consuming. By Laura on 5/3/12
Laura would recommend this product to a friend
I found that I prefer the API calcium test kit because it had less steps, and was reliable.
This is a good tester By thomas on 4/22/12
thomas would recommend this product to a friend
I see lots of reviews on the challeges of using this tester but is not that hard at all just follow the instructions and you will have accurate instant results. throw out that color matching junk and get with the new world of digital readouts
works but a lot of steps By Nikunj Patel on 4/9/12
Nikunj Patel would recommend this product to a friend
great product wish the calibration had less steps
great By nikunj patel on 4/9/12
nikunj patel would recommend this product to a friend
great product, first one that was sent was defective but BRS was great in replacing it no hassle.
Terrible Product By J Co80 on 3/31/12
J Co80 wouldn't recommend this product to a friend
Never got an accurate reading!! Always had either a flashing 600 meaning cal levels were over 600 or L.lo meaning low light......
Simple and Accurate By Rod on 3/29/12
Rod would recommend this product to a friend
The bottom line is this is a great test kit so long as you read and understand the directions. Double reduncancy testing on several separate occasions have proven it accurate and cosistant.
awsome but a bit complex By mygolfisslow on 3/14/12
mygolfisslow would recommend this product to a friend
i recently won one of these in a raffle. and love it. it is super accurate. the process is a bit complex but once you get the hang of it, it goes quick.
great product By Scott on 3/5/12
Scott would recommend this product to a friend
This is so much easier with the digital readout.
nothing consistant By russell on 3/2/12
russell wouldn't recommend this product to a friend
tested 10 times got ten different results using 0 tds r.o. water called hanna tech support guy told me it was too difficult to use and he himself would not use it on his own reef tank!!!!!!! This coming from the hanna tech himself I wont mention his name...... Then he sent me the "other" intructions not included with the unit still did not check consistant,, but better than at first. My salifert will give the same results time after time. This test kit will sit and collect dust being I cant return it !!!!!!!!!!!!
nothing consistant By russeko8 on 3/2/12
russeko8 wouldn't recommend this product to a friend
tested 10 times after purchase got 10 different results called hanna for tech support guy told me he used it, and it was difficult would not use it on his own tank!!!! Then sent me the other instructions not included with the unit to help get good results still was not that consistant. My salifert tester checks the same everytime. This thing will sit and collect dust being I cant return it!@!@!\ Thanks
Not accurate enought to be useful By Actuary on 2/22/12
Actuary wouldn't recommend this product to a friend
I am a big fan of some of the other Hanna Checkers - primarily alkalinity and phosphate. However, they really missed the mark with this checker. Not only is the test rather complicated compared to the others, it is highly inaccurate. I should have looked at the specifications where the accuracy is stated as +/- 6%. I purchased it to try to get an accurate daily calcium uptake in my SPS reef. When you get consecutive readings which are 50 ppm apart it is essentially worthless. Stick with a good titration test kit such as Elos or Salifert until Hanna makes some serious improvements.
Another Good Hanna Coloromiter By Roy on 2/19/12
Roy would recommend this product to a friend
While I did not buy my Calcium Colorimeter through BRS(and paid more), I am very happy with it. It is a little more complicated testing procedure than their other Colorimeters but I've found it to be accurate. I also use distilled water for the test and make sure to be very accurate with all the measurements. It's much better and faster than doing a titration test to determine Ca levels.
Unreliable readings By Eric on 2/12/12
Eric wouldn't recommend this product to a friend
I have the other Hanna checkers and love them, but the results on this one are all over the place. Complete the test multiple times and you will get a wildly different result each time. I now use the Red Sea Coral Pro Calcium Test Kit.
Got to get one By bobby on 1/23/12
bobby would recommend this product to a friend
I love this tester knock on wood i have not had any issues with this unit. So easy to use anyone can do it.you can not beat the price BRS is the place to shop they do not sell snake oil cures meaning that they do not sell junk
Confidence inspiring By Ken J. on 1/21/12
Ken J. would recommend this product to a friend
I am a novice in this hobby, but not with meters. We use a number of Hanna professional products at work and I was pleased to see that they made "hobby grade" instruments for aquarists. They don't display the build quality of a professional meter, but they don't cost hundreds of dollars either. The case, while durable, is clearly a cheap product. There are a hundred chinese shops that can produce plastic cases which close properly. But you are buying a meter (not a plastic box) and the price is right for this one. I would not think twice about the purchase. The Ca checker is more complicated to use than the other Hanna checkers, but that is a function of the test, not the meter. Buy it, adjust your levels with confidence, and get back to watching the corals.
Good product By shane on 1/20/12
shane would recommend this product to a friend
Works great as long as your RO you use for the test is 0 ppm but on the up side it is really acurate and only paying 9 bucks for the refills is way better than paying 40 bucks for a new test kit every time it runs out.