Kh tester Hanna accurate

[Baylott224]

How many times do everybody
test alk to decide on a reading I do one the n I'll do one more if it is within. 1 I'll take the second reading and log that. If its way off I'll do it a third time. If is of by. One test would be 8.5 then the second test is 8.6 then I do it again it's 8.5 is that normal

 

[rishma]

Totally normal.

The accuracy is ±0.3 dKH. So all three of those measurements are essentially the same.

I have had reagent go bad and give bad results. If I get a suspect result I double check with a titration kit.

 

[gbroadbridge]

^^^^ As said above :-)

If you want another test to sanity check the Hanna reading if it seems way off, I'd suggest keeping a salifert test kit around.

Unlike the Hanna, the reagents pretty much never expire and the test has similar accuracy.

 

[Baylott224]

So 2 is enough if they are within. 1

 

[Baylott224]

No actually it's exactly where I want it

 

[Baylott224]

No actually it's exactly where I want it

That's waht Ive been doing I just wanted someone else take on it

 

[Baylott224]

Dosing all for reef and it was dropping like. 1 dkh in 2 weeks so now I upped the dose by 1 ml a dau

 

[Baylott224]

But the tests have never been more the. 2 apart mostly just. 1 apart so. I'm happy. Just have alittle ocd so times I think I put a. 00000001 too much reagent or I got a hair in it then I end up dumping and going again lol

 

[rishma]

But the tests have never been more the. 2 apart mostly just. 1 apart so. I'm happy. Just have alittle ocd so times I think I put a. 00000001 too much reagent or I got a hair in it then I end up dumping and going again lol

Well, I am afraid the reality of the test accuracy is going to bother you. Hoping two back to back tests to be within 0.1dkH is not what the tester is designed for.

If you get 8.5. The true alkalinity could be anywhere between 8.2 and 8.8 and the tester is working within spec.

If you are targeting between 8-9 like me, I am happy if I fall in that range.

 

[VintageReefer]

I test with it once. As said above, accuracy is +/- .3

So this means…if your water TRULY was 8.5 then the tester can tell you anything from 8.2 to 8.8 and be within spec

It telling you 8.5 one time, 8.6 another, and 8.4 a third time - this means nothing and is a waste of reagent. They all mean the same thing.

 

[VintageReefer]

But the tests have never been more the. 2 apart mostly just. 1 apart so. I'm happy. Just have alittle ocd so times I think I put a. 00000001 too much reagent or I got a hair in it then I end up dumping and going again lol

If you want consistency then do as I do and get this for your 10ml sample
Bonus - almost all the tests need 10 ml and this can be used for all of them

Extra bonus - this is faster than filling vial to 10ml mark with included pipette

Extra extra bonus - the 10ml line on the vial, is not 10 ml so your current results are not accurate anyways

https://a.co/d/9aCPyaK

 

[rishma]

But the tests have never been more the. 2 apart mostly just. 1 apart so. I'm happy. Just have alittle ocd so times I think I put a. 00000001 too much reagent or I got a hair in it then I end up dumping and going again lol

If you want consistency then do as I do and get this for your 10ml sample
Bonus - almost all the tests need 10 ml and this can be used for all of them

Extra bonus - this is faster than filling vial to 10ml mark with included pipette

Extra extra bonus - the 10ml line on the vial, is not 10 ml so your current results are not accurate anyways

https://a.co/d/9aCPyaK

I’ve thought about buying one of those because it would make it easier for my daughter to get repeatable results when she does the test for me. Then I thought, I should also get one for the 1ml of reagent…then I thought…why am I spending $80 to buy 2 to make a sufficiently accurate test more accurate?

And then you post this and I start the whole process again. Someday I’ll impulse buy 2 of them and be happy.

 

[VintageReefer]

I’ve thought about buying one of those because it would make it easier for my daughter to get repeatable results when she does the test for me. Then I thought, I should also get one for the 1ml of reagent…then I thought…why am I spending $80 to buy 2 to make a sufficiently accurate test more accurate?

And then you post this and I start the whole process again. Someday I’ll impulse buy 2 of them and be happy.

You don’t need two. The one I use adjusts from 1ml to 10ml

You might want two of the tips so one is clean for sw and one is ready for reagent. It might come with two tips. I forget.

When I do the calcium test I dial it down to extract distilled water. I think that test needs 9ml. When dosing cipro in my tank (had to for bjd outbreak) I needed 4ml daily, I used this to get my 4ml. Many uses

 

[gbroadbridge]

If you want consistency then do as I do and get this for your 10ml sample
Bonus - almost all the tests need 10 ml and this can be used for all of them

Extra bonus - this is faster than filling vial to 10ml mark with included pipette

Extra extra bonus - the 10ml line on the vial, is not 10 ml so your current results are not accurate anyways

https://a.co/d/9aCPyaK

I just use a 10ml disposable syringe from a pharmacy.
Costs about 10 cents and are guaranteed to be accurate.

 

[VintageReefer]

Gotta line that plunger up perfect with the lines. For me it’s hard to focus sometimes. This has no thought process for me and no chance of mistake. It’s perfect 10ml every time. If your eyes are good, by all means use the syringe

 

[rishma]

I’ve thought about buying one of those because it would make it easier for my daughter to get repeatable results when she does the test for me. Then I thought, I should also get one for the 1ml of reagent…then I thought…why am I spending $80 to buy 2 to make a sufficiently accurate test more accurate?

And then you post this and I start the whole process again. Someday I’ll impulse buy 2 of them and be happy.

You don’t need two. The one I use adjusts from 1ml to 10ml

You might want two of the tips so one is clean for sw and one is ready for reagent. It might come with two tips. I forget.

When I do the calcium test I dial it down to extract distilled water. I think that test needs 9ml. When dosing cipro in my tank (had to for bjd outbreak) I needed 4ml daily, I used this to get my 4ml. Many uses

I realized I didn’t need 2, but it didn’t look like I came 2 tips that I could tell. I looked at buying tips and they come in big packs and not that cheap. And I don’t think I can count on my daughter to clean the tip.

I know I’ll eventually buy this, not because I need it, but it sure is cool.

 

[Randy Holmes-Farley Verified Community Expert]

I test with it once. As said above, accuracy is +/- .3

So this means…if your water TRULY was 8.5 then the tester can tell you anything from 8.2 to 8.8 and be within spec

It telling you 8.5 one time, 8.6 another, and 8.4 a third time - this means nothing and is a waste of reagent. They all mean the same thing.

where did that copied comment on “precision” come from?

It is an incorrect use of the word. Precision and resolution are the same thing. Accuracy is entirely different. Hanna seems to make it clear on their web site by using the word accuracy:

Specification	Detail
SKU	HI772
Range	0.0 to 20.0 dKH
Resolution	0.1 dKH
Accuracy @ 25°C (77°F)	±0.3 dKH ±5% of reading
Light Source	LED @ 610 nm
Light Detector	silicon photocell
Method	colorimetric method. The reaction causes a distinctive range of colors from yellow to green to blue to develop
Battery Type	(1) 1.5V AAA
Auto shut-off	after ten minutes of non-use
Environment	0 to 50°C (32 to 122°F) RH max 95% non-condensing
Dimensions	86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5in.)
Weight	64 g (2.3 oz)
Ordering Information	HI772 Checker®HC is supplied with sample cuvettes with caps (2), alkalinity reagent starter kit (reagents for 25 tests), syringe with tip, battery, instructions and quick start guide.
Reagent Set	HI772-26 (25 tests)
Calibration Check	HI772-11
Warranty	1 year

 

[Randy Holmes-Farley Verified Community Expert]

I’ve thought about buying one of those because it would make it easier for my daughter to get repeatable results when she does the test for me. Then I thought, I should also get one for the 1ml of reagent…then I thought…why am I spending $80 to buy 2 to make a sufficiently accurate test more accurate?

And then you post this and I start the whole process again. Someday I’ll impulse buy 2 of them and be happy.

Why use it at all. A diy alk titration is accurate, quick, and far, far less expensive. :)

 

[rishma]

I’ve thought about buying one of those because it would make it easier for my daughter to get repeatable results when she does the test for me. Then I thought, I should also get one for the 1ml of reagent…then I thought…why am I spending $80 to buy 2 to make a sufficiently accurate test more accurate?

And then you post this and I start the whole process again. Someday I’ll impulse buy 2 of them and be happy.

Why use it at all. A diy alk titration is accurate, quick, and far, far less expensive. :)

Fair challenge.

The main reaons is it’s very simple. My daughter does it for me while I am away. It’s easy to be consistent and it’s accurate enough for my purposes.

Also, I honestly have a hard time detecting the color change in titration. I’m never quite sure if I’m done, over did it, or not quite enough. It probably doesn’t matter much, I’m sure I’m close enough, but that failing of mine means titration probably isn’t any more accurate for me personally.

 

[VintageReefer]

where did that copied comment on “precision” come from?

It is an incorrect use of the word. Precision and resolution are the same thing. Accuracy is entirely different. Hanna seems to make it clear on their web site by using the word accuracy:

Specification	Detail
SKU	HI772
Range	0.0 to 20.0 dKH
Resolution	0.1 dKH
Accuracy @ 25°C (77°F)	±0.3 dKH ±5% of reading
Light Source	LED @ 610 nm
Light Detector	silicon photocell
Method	colorimetric method. The reaction causes a distinctive range of colors from yellow to green to blue to develop
Battery Type	(1) 1.5V AAA
Auto shut-off	after ten minutes of non-use
Environment	0 to 50°C (32 to 122°F) RH max 95% non-condensing
Dimensions	86.0 x 61.0 x 37.5 mm (3.4 x 2.4 x 1.5in.)
Weight	64 g (2.3 oz)
Ordering Information	HI772 Checker®HC is supplied with sample cuvettes with caps (2), alkalinity reagent starter kit (reagents for 25 tests), syringe with tip, battery, instructions and quick start guide.
Reagent Set	HI772-26 (25 tests)
Calibration Check	HI772-11
Warranty	1 year

It’s a screen grab from a random site when I was fact checking the accuracy. I agree precision is the wrong word. The point of the post remains valid and I used the correct word in my post :)


Couple places have it with the wrong word