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Daryl Ernest
Reviewed in the United States on June 23, 2016
Good
Dee
Reviewed in the United States on August 25, 2015
Had a Hanna O2 meter that would not auto calibrate, since it was more than 15% over the set point, there is no way to zero it manually. The manual doesn't give any instructions, except to say you should zero it occasionally or when you change the sensor. Got this to try out, lasts one month after mixing the two components... for a one time use, seems like a lot of liquid, a small child can take a bath in this. The big bottle is 1 liter of dionized water, which I can easily make, and the little bottle is 12 grams of sodium metabisulfide, wow seems like a rip off. If you are in the water business you have this stuff. Manual could be a lot clearer.
JAY W DOXTADER
Reviewed in the United States on November 27, 2014
A
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