Hanna Colorimetric Checkers for Alk and Ca? F! yes!!

[muck]

Originally Posted by Delphinus

To have alkalinity electronically testable in a hobbyist affordable handheld is a very interesting development, so I must say it's worth of a raised eyebrow. However I wonder how robust it will be. Take for example the probe based nitrate testers .. very fussy and finicky, the probes don't last long and they're brutally expensive to replace - compared to test kits anyhow.

The colorimeters are a little better for robustness but have their own issues. However for a colour comparison based test, a colorimeter certainly takes guesswork out of comparing hues and intensities in potentially variable lighting conditions.

Nevertheless, an interesting development and one worthy of watching out for!!