I've only had to calibrate this a few times after almost daily use over two months.
The primary use of this instrument has been to check the sap pH of crops.
The instructions are moderately obtuse with regards to calibration. If you are doing a two point calibration - do them one right after another, don't let the device time out.
Horiba LAQUAtwin B-713 Compact pH Meter
Date Added: 11/26/2012 by Carrell M
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