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It seems that the biggest/only gripe about this unit in the reviews is that it uses a powder reagent and not a liquid.
Is it really that hard to open the packet and get all of the powder in the vial?
We do not have issue with the packets, As long as the packet is shaken to the the power into one corner, The flap is then cut and the packet folded to allow the power to fall down the crease in the packet we have not had issues ourselves.
The Hanna Calcium Checker comes with enough reagent to do about 25 tests.
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They do not make a Nitrate checker. If/when they do though we will bring it in.
Easier to use and more accurate than chemical test kits
The HI 758 Calcium Checker®HC is extremely simple to use.
Dedicated to a single parameter
Designed to work with HANNA's liquid reagents. Uses 10 mL glass cuvettes.
Small Size, Big Convenience
Weighing a mere 65 g (2.3 oz.), the Checker®HC easily fits into the palm of your hand or pocket.Use for quick and accurate on the spot analysis. Single button operation: Zero and Measure Operated by a single AAA battery.
- Range: 200 to 600 ppm
- Resolution: 1 ppm (mg/L)
- Precision: ±6% of reading
- Light Source: LED @ 610 nm
- Light Detector: Silicon photocell
- Environment: 0 to 50°C (32 to 122°F); RH max 95% non-condensing
- Battery Type: (1) 1.5V AAA
- Auto-off: After 10 minutes of non-use and after read
- Dimensions: 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5")
- Weight: 64 g (2.25 oz.)
- Method: Adaptation of the zincon method
Terrible inconsistency By Eric on 4/23/2017Eric wouldn't recommend this product to a friendI have the alkalinity checker and this Ca checker. While the alk checker is great, this thing is junk. Always tests way too low. Save your money and get the Red Sea or Salifert kits. They take more effort to use, but my reef is worth it.
Don't waste your money By Deborah on 4/3/2017Deborah wouldn't recommend this product to a friendWhile I love the other Hanna Checkers, the Calcium tester reads false. I have readings that are through the roof and just about pulled my hair out trying to figure out my tank's wacky chemistry until I read online all the other complaints. I then pulled out my Red Sea test kit and checked my Calcium three times and all three were in the normal range.
Do yourself a favor and skip the Hanna Calcium checker.
High Readings By Alex on 3/29/2017Alex wouldn't recommend this product to a friendThe sheer number of complaints of high readings is no coincidence and defies the suggestion of user error. I've used this tester a dozen times and every time the readings are 75-100ppm high. Id almost be willing to accept that and simply deduct that amount, but the test readings are never consistent either. For instance, immediately after a water change, I got a reading of 500ppm and a week later before I was going to do my water change I got a reading of 540. I'm not dosing.
Don't buy it By John on 3/15/2017John wouldn't recommend this product to a friendTest come out alway above 520 ppm wast my money don't by it
Do not buy!! By RobertP on 3/13/2017RobertP wouldn't recommend this product to a friendI have a little trouble with colors so was not sure I was reading my red sea tests correctly. So i bought this hanna and I still dont! It consistently reads 580 and i reran the test 4 times. My red sea is constantly at 400 and 420. Since I am not dosing yet and doing weekly water changes it tells me rhis thing is junk. Im going to try it again and call hanna because this is $50 wasted.
Not worth buying By Joshua on 10/13/2016Joshua wouldn't recommend this product to a friendI 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 9/29/2016jason wouldn't recommend this product to a friendi 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 9/17/2016Josh would recommend this product to a friendI 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 8/29/2016Mark wouldn't recommend this product to a friendThis 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 8/27/2016virginia wouldn't recommend this product to a friendResults 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 8/17/2016John wouldn't recommend this product to a friendI 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 7/19/2016Mikey wouldn't recommend this product to a friendCan 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????