hanna checkers
i've had no problems with my test kits(calcium,alk,phos,nit,& iod)the checkers that need the button held on them i've printed hold on them to remind me.the ca does take practice to use as your using only 1/10 of the syringe to a full one of the regent and a lot of people make a mistake on this step.what i like about the checkers is that you are not having to compare colour scales,but are getting a digital readout
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