I switched out Reagents A, B, C this morning for the time and also calibrated it for the first time since the initial start up a couple months ago. I'm a little confused by the readings I got. Prior to the calibration, my readings were pretty much spot-on to my settings...8.75 alk, 450 calcium and 1250 mag. It calibrated fine this morning but when I ran the first test afterwards, it read 9.25 alk, 390 calcium and 1250 mag. I'm trying to understand why my alk and calcium readings would be so different after the calibration?