While the SpeedStir is nice for that test I find it really shines for the CA test. It makes it so much easier to tell when the color changes.
Speed Stir is worth the money!!!
- Thread starter mrich1974
- Start date
Yep. I just like the idea of being able to continuously add reagent drops without having to stop, recap and swirl. Some folks are good at holding the tube, squeezing out the drops and swirling all at the same time. I'm not that good and I'd likely just splash the test solution all over myself.
Plus, having worked in chemistry labs all my life, it drives me nuts not having a stir plate.
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Question - what color are the built in LEDs and does that color a affect your ability to see an end point?
I am, like many males, slightly red-green color blind (I can't pass those stupid color dot charts at the eye doctor). The way I do the pH test is that I check the color at hip height with my back to the sun light and then I use the acid demand reagent (R-0005) to see how the color changes. It helps to see the transition from red to yellow-orange as the pH drops from the R-0005
It would be nice if there were a different color option for pH.
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I am, like many males, slightly red-green color blind (I can't pass those stupid color dot charts at the eye doctor). The way I do the pH test is that I check the color at hip height with my back to the sun light and then I use the acid demand reagent (R-0005) to see how the color changes. It helps to see the transition from red to yellow-orange as the pH drops from the R-0005
It would be nice if there were a different color option for pH.
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Personally I do not like using the LED in the SpeedStir as it makes is harder to see the end point ... a very very light pink might be washed out by the white light.
The key to the pH test is to hold it up against a very bright, very white background. Even off-white stuff can make it harder to tell the actual color.
I have heard and found that the blue sky is a good background for me ... so I am not sure how important "white" is.
But it should affect the comparison colors in the same way as the sample ... so what if it is purple instead of red .. which of course is too high anyway 
My concrete, in full sun light, is a good light grey background. I should try the sky though and see how that works.
Thanks all! Definitely going to order the speed stir soon.
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Thanks all! Definitely going to order the speed stir soon.
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The Speed Stir is the only way to go. It helps test your pool water more efficiently.
Tried it. I found it worked ok for me at low pH colors but went too purple on me at 7.8-8.0 where I could not tell them apart.
I went over to my pavers which are brown and reddish colored and that actually gave me the right contrast for all colors.
I'll say it again, I sure wish there was a different choice in pH color indicators at the 6.8-8.0 range.
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I use the speed-stir both with the light off and the light on.......simply to see if I notice any different results.....I don't
Keep in mind the drops based tests are not so much a change from red to blue (for example) but rather a color change who's change is carried to completion. It is when the last drop has no affect on the color of your test solution.......then the color change is complete.....not before.
So it is the COMPLETION of a color change.......not the color change itself.
Keep in mind the drops based tests are not so much a change from red to blue (for example) but rather a color change who's change is carried to completion. It is when the last drop has no affect on the color of your test solution.......then the color change is complete.....not before.
So it is the COMPLETION of a color change.......not the color change itself.
Yeah, I don't typically have a problem with end-point detection. The problem is pH. It's a strict color gradation which can be very subjective and hard for those with color blindness. I typically ask my wife to double check my color determination just to be sure. I also use the acid demand reagent to force the pH down to see what colors I transition to.
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The Speed Stir and Sample Sizer are a lazy persons dream! The Sample Sizer especially makes it easy to maintain continuity between tests.
Kevin T
Kevin T