$10 bet on Boomer saying no good 
The light is still not on at Hanna until we see some actual "real" tests. Those that say it is accurate or right on have allot to learn.
They had issues with the earlier Alk ones
Yah, as I pointed it out to them and what is the like the 3rd attempt no to say it works correctly now.
the calcium one is not any different than a normal calcium test other than it reads the color for you and gives an exact number in PPM.
Not even, people need to learn the meaning of the word "Accuracy"
| Accuracy @ 25°C | | ±6% of reading |
Calcium Checker HC Handheld Colorimeter, HI 758 | HANNA Instruments
Math Lesson 101
Meter reads 450 ppm Ca++
450 x ± 6% = ± 27 added to or subtracted from 450
So, that calcium level of 450 you have is sooooooooooomewhere between 423 - 477 and you do not know where and that is a 54 ppm spread.
Calcium in water as carbonate is one of the primary components of water hardness which can cause pipe or tube scaling.
https://hannachecker.com/index.php?...ategory_id=36&option=com_virtuemart&Itemid=29
That can not even word harness correctly. If calcium is in the water as carbonate it is Calcite, CaCO[SUB]3[/SUB] which you
do not want the meter picking up, not that it is.
It should read: Calcium in water, often expressed as calcium carbonate, is one of the primary components of water hardness which can cause pipe or tube scaling. Note: expressed, I can express some ion in the water or a salt any way I want. Meaning, if I want, I can express that CaCO[SUB]3[/SUB] as say MgSO[SUB]4[/SUB] or Mg++ as Ca++ and to make a point, CaCO3 as Uranium Hexafluoride (UF[SUB]6[/SUB]). It is like expressing temp as F, C or K.
When one expresses WH as Calcium Carbonate, such as 250 ppm CaCO[SUB]3[/SUB] it is a gross misleading of what is there and it can misled people. It really means that if all the calcium in the water was or could to attach itself to a carbonate ion (CO[SUB]3[/SUB]--) , that is how much Calcite it could produce/make, not that it is. So, if I have water with Calcium Chroide in it and there is no CO[SUB]3[/SUB]-- in the water the WH kit will still be as 250 ppm CaCO[SUB]3[/SUB], even though there is no CO[SUB]3[/SUB]-- there. CaCO[SUB]3[/SUB] has a MW of ~ 100 g / mol and Ca++ makes up 40 % of that 100. So, the amount of Ca++ in that 250 ppm CaCO[SUB]3[/SUB] is really 250 x 40 % = 100 ppm Ca++.
Note:
I for sure am not against Hanna by a long shot I want these metes to work but they need to be more accurate. I have had many dealings in the past with Hanna, HACH and LaMotte on issues.
