Pinpoint ph probe with apex

[ultreef]

Anyone using their apex with the pinpoint ph probe?

Just picked up a new probe but can't get it to calibrate on the apex. Did some google and some say it doesn't work some say keep trying. Well I've tried about 5 different time. And left probe in calibration fluid for more than 30mins. But still not working.

Would like to hear if someone is actually using pinpoint with their apex. Lfs has never heard of this problem.

Any help? Thanks.