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Old 03-21-2010, 08:09 PM   #1
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New Phosphte checker from Hanna

Don't know if anyone has tried this yet. I just found it on another board. It's a handheld colorimeter fron Hanna uising the same reagent as their expenisve units.

What gets me is the Resolution: 0.01 ppm (mg/L) and Precision: ±0.04 ppm (mg/L) ±4% of reading @ 25°C

Better than any of the test kits on the market.
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Old 03-21-2010, 10:51 PM   #2
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Let us know how it works out.
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Old 03-22-2010, 02:13 PM   #3
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So you're assumng I'll be the forstone to try it????

I couldn't do that to you Larry. So please, let us know how it works for you.


There is a sponsor of the other site that has them for $39.99 so I might order one to test it. You can do 6 tests, so it's not exactly cheap
"I 713
Checker®HC is supplied with (2) sample cuvettes with caps, (6) powder reagents for phosphate, (1) 1.5V AAA battery and instructions"

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Old 03-22-2010, 04:17 PM   #4
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I saw that Hanna unit a bit ago, but wasn't overly impressed with the 0.04ppm precision. Granted... it's a budget unit, and you can't expect bench-quality measurements for that cheap. But at 0.04 precision, you could have a true reading of 0.000, but read 0.04... or vice versa. And since my Salifert test kit's first color chip is at 0.03 ppm, I don't see it as much improvement.
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Old 03-22-2010, 06:30 PM   #5
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That's because you're younger and have better eyes than me my friend. I have a problem with color chips (color blind) so havnig a digital readout works for me.
I have an API kit now. I'll post a photo when I get home so you can tell me if I have 0 or the first scale up cause I can't tell the difference.

That's why I like the Salifert tests for Ca, Mg and Alk so much. They have a sharp color change.

BTW, I pre-ordered one of these. If they get enough from Hanna I might have it for the weekend as I can pick it up nearby.
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Old 03-22-2010, 08:01 PM   #6
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Well... it's good to hear that you're beating Larry to it, and we'll have an in-depth review from you soon. You'll compare it against the more expensive one... right?

I can't even imagine using these color charts if I was color blind. So many times the difference between zero and not-zero is just a subtle hint of a color. That's the way my phosphate kit is.
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Old 03-22-2010, 08:20 PM   #7
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Well I don't have a more expensive one to test against, BUT I guess I could do the same I'm doing with my thermometers. Bring a sample to work and ask metrology to test the sample. THEY have the real expenisve colorimeters (pharma). Can't imagie what favors that will cost me <g>.

So Kurt, what's my current reading?




BTW, I used a Salifert syringe to measure out the 5 ML of water for the sample. The silkscreen on the API bottles is always off.
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Old 03-22-2010, 09:32 PM   #8
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Quote:
Originally Posted by cmor1701d View Post
Well I don't have a more expensive one to test against,
Sorry... poor attempt at a joke. I meant that you should get the expensive one too, so that the rest of us would benefit from your thorough testing! Kinda like taking one for the team!


Quote:
So Kurt, what's my current reading?
Ahhh... you see... there's a reason I don't use the API phosphate kit! I'm not color blind and I could never figure that one out!
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Old 03-22-2010, 09:47 PM   #9
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Its between 0 and .25, however very close to 0. Too light to be .5.
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Old 03-23-2010, 10:09 AM   #10
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LOL, Kurt. I know the $300+ colorimeters have much pretty precision, but as I've never really had a phosphate problem I couldn't see investing in one. This handheld is cheap enough to buy for the 3-4 times I test in a year.
I will ask at work about bringng a sample in to check against what our metrology department uses so I should be able to offer some comparison <g>.

Thanks AMD. That's what I thought too. It's not quite zero, but I guess the test is is not precise enough for a finer resolution.

Thanks.
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