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- Hanna Checker Calcium Colorimeter
Starting at: $12.99
21 Reward Points$21.99
7 out of 10 By Jordo on 12/8/13Jordo would recommend this product to a friendThis 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 12/8/13Bob would recommend this product to a friendI 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 10/5/13Matt would recommend this product to a friendI'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 4/18/13Jason wouldn't recommend this product to a friendI 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 4/16/13Adam wouldn't recommend this product to a friendI 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 3/9/13Mark would recommend this product to a friendAnything 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 2/13/13Miles would recommend this product to a friendThis 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 2/3/13Gary would recommend this product to a friendYou 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 12/15/12Chad wouldn't recommend this product to a friendI 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 11/30/12Dawn would recommend this product to a friendI think it is a great tester!!! Mr saltwater tank recomends them tooo!!!!
Very handy By Aaron on 11/19/12Aaron would recommend this product to a friendI 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 11/6/12brad would recommend this product to a friendi am happy with this checker went step by step and tested my water and showed 533ppm
Ask a Question About 'Hanna Checker Calcium Colorimeter'
Previously Asked Questions
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
Deal of the Day!
BRS 5 Stage PLUS RO/DI System - 75GPDEnds in
Regular Price: $199.99
Special Price: $179.9900:00:00:00
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Hours: 9am - 5pm CST M – F
6325 Sandburg Road, Suite 400
Golden Valley, MN 55427 Map
View Larger Map 6325 Sandburg Road, Suite 400, Golden Valley, MN 55427