ELOS

[mrhasan]

Originally Posted by chi

Or go really hardcore and go Hanna. Digital. All the wayyy

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Pay $60 for something whose error margin can be anywhere between 0.4 to 0.7 dkh? No thank you! Atleast with salifert, you can calibrate the color you should be looking for with the supplied solution. Hanna's hobby grade photometer seems to get a bit funky with every test; atleast that's what I read.

Hanna photo's are only good for phosphates but then again it has an error margin of 0.04 ppm which can make some significant difference.