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hydroponics07
11-23-2009, 01:54 PM
Hello guys,

i have the Hanna Instruments model HI-98129, pH, TDS, Ec and temperature meter (the black). i wanted to ask if anyone knows after how many uses should i do calibration?

Thanks for advance.

steveje0711
12-03-2009, 10:07 AM
From practical experience, if you want to maintain tight controls, about 10 uses per cal.

Rgds,

Steve
N. Texas