I recently set up a cal reactor and bought a second probe. After I calibrated it, I was shocked to see that it said my PH was 7.6 (current probe read 8.24). So, I attempted to calibrate the old probe. I got a calibration failed message. I assumed my old PH probe needed replacing, so I went and bought another probe. I calibrated that one and it was successful, but said my tank had a PH of 10. I used different brand solutions both times. The weird thing is that during the "stablizing" period, the values didn't really move. Also, the 10 solution was reading in the sevens. Any thoughts? Is it possible I have 3 bad probes?