Pinpoint pH Monitor

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I've had mine for a couple of months, I use it with a battery. I am not so thrilled with it.

It seems to wander quite a bit. Even during calibration it will wander by 0.05 or so. I have recalibrated it monthly and I just don't have confidence in the readings. It reads down to 0.01 pH but what is the point of that when the accuracy is probably off by 0.1 to 0.2 units?

I wish I'd just bought one of the cheap pH pens, more easily portable for use on several different tanks.