I've always wondered how long to wait when calibrating a PH probe. The instructions say to let it settle, when is that? My ACIII readout just says settling, have never seen it say settled. I've let it sit in the calibration solution for 15 minutes in the past, tried something different last night and watched the numbers, when they stopped moving I hit select and moved on. When the probe calibrated it told me my PH was 8.45, never seen it that high so I doubt that the probe is correctly calibrated.