Does anyone use this Hanna PH tester?

[vickreyreef]

Description: Hanna Instruments Waterproof pH Tester with Replaceable Electrode w/ accuracy ±0.05 pH


Is it good?

[bertoni]

We'd need a model number or a picture to say much, but if it can take pH 7 and 10 calibration points, it's likely okay.

[vickreyreef]

pHep 5
(Mfg# HI 98128)pHep 5
(Mfg# HI 98128

[bertoni]

That should be okay. I'd be sure to get some good pH 7 and 10 calibration solutions.

[cd77]

Bertoni -- Can pH calibration solution be re-used?

[bertoni]

I only use the single-shot pouches. I don't think most calibration solutions are reusable.

[cd77]

Thank you -- another person mentioned that the pH 10 solution would be rendered useless due to CO2 exchange after opening. The Hanna pH unit I purchased instructed me to save the calibration fluids if I recall correctly. I appreciate the 2nd opinion

[24gnanonewbie]

What do you guys recommend for an inexpensive pH monitor?

Sorry to high jack your thread...

[vickreyreef]

no apologies necessary!!!! I am always interested to hear answers to those questions too!!!

[bertoni]

I use an Oakton pHTestr unit that I like, but it's more expensive. This pHep should be fine, if calibrated properly and kept clean.

[poppin_fresh]

I have that Hanna meter. It works good, but the temp feature takes for freakin' ever to settle on the temp. Its supposed to be very accurate so I use it as a double check for my controller, but it takes several minutes to get a solid reading.

[poppin_fresh]

just clarify my post...

The PH function works well... and quickly too. Its the temp reading that is very slow.

[scaryperson27]

It has a .5 resolution?

What is this I hear about the PH: 10 calibration fluid being rendered useless... Is it true?

[bertoni]

I'm not sure what you mean. The single-use pouches of pH 10 solution should be fine if stored properly and used before expiration, assuming the brand is good.

[vickreyreef]

I bought the 4, 7& 10 solutions to calibrate it....was that the right thing to do? Also is the calibration a simple process or are there any tricks to share?

[bertoni]

Calibration with the 7 and 10 solutions should be fine for measuring reefs. Does the meter accept three calibration points? I thought it only took two, but it might take three.

[vickreyreef]

The marine depot customer service person told me it would be incredibly accurate if we did all 3 calibrations....so I went with that....maybe someone that has one can tell me if I got sold a bill of goods?

[bertoni]

It'll be better for testing solutions between 4 and 7 if it's calibrated with those buffers. I wouldn't expect calibration at pH4 to help with testing a tank, well, a tank that's still live, anyway.

[cd77]

Originally posted by vickreyreef
The marine depot customer service person told me it would be incredibly accurate if we did all 3 calibrations....so I went with that....maybe someone that has one can tell me if I got sold a bill of goods?

The way I understood the directions, it's an either/or kind of thing -- that is you can calibrate it using ph4 and ph7 or ph7 and ph10, but not all three. Maybe it differs model to model. I tried doing both calibrations, but when I sampled it using my aquarium water it only seemed to rely upon the last two-point calibration. E.g., when I calibrated with ph4 and ph7 I got a ridiculous measurement from my SW tank, and vice-versa with my FW tank.

[vickreyreef]

ok so i should only use 7 & 10 then right?

[cd77]

Yes, unless you plan to put discus in your reef.

[shikhyung]

Hello, How often that you have to calibrate the meter? Shin.

[shikhyung]

I meant to use the solution to calibrate. thanks.