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- #481
Maybe that's the problem ... I just rinse the end off & put the cap back on after I use it. Didn't know it should be kept in solution. 1st time I've heard that. Thanks.Most pens come with instructions on how to calibrate them. Typically you need a high(7.0) and low(4.0) buffer solution.
You also use this solution to store the pens so the tips don't dry out. Sitting in water is a no-no.