pH test for the color blind?

[cmor1701d]

I have a Pinpoint monitor (on it's 2nd probe). I want to check it against a liquid test kit as I'm not happy with my readings even though I just calibrated it.

I'm not totally color blind but I do have a hard time with subtle shade differences. That's why I use Salifert for nitrate, Ca, MG, Alk. I think their pH test kit has a color strip that is hard to read (harder than the nitrate test).

Does anyone know of a pH test kit that gives a sharp color change at different readings in the 8.0 0 8.4 range?

 

[cmor1701d]

I picked up an API high pH test kit at the lfs today. It had the best color chart (clear differences) and I was able to confirm that tank pH is fine but my meter is off, way off. The probe is only 14 months old too. Guess this one went early.

 

[ccCapt]

Thanks for the info.
Bummer the probe went bad. I assume you had a feeling something wasn't right since you were looking for a test kit.

 

[jasonoconnell]

I have the API kit. I find that it is really tough to distinguish between the lower end of ammonia readings, and the difference between 5-10 on the NitrAte chart.

 

[cmor1701d]

Hmm...I use the Salifert for nitrate. Mine are so low I have to look through the side and I although the colors are all a slight shade of different, I can tell by the graininess and depth of color with that kit.

I'm only using the pH kit as my probe was reading in the 6.7 range.

 

[Innovator]

Is there a specific color combination you are having problems with (blue-green, red-green, etc)?

 

[roka64]

That's funny, I have a hard time reading API's pH test.