OK, so an electronic monitor is DEFINITELY something to get used to
. First off... how is the livestock? If they are all ok... don't worry too much! I go through a daily fluctuation from 7.82 up to 8.23 *everyday*... Its normal.
There are a few things to try though.
1) Recalibrate the probe. Make sure to use deionized or distilled water preferably from a pharmacy to rinse the probe between standard solutions.
2) I'm not sure about the calibration process for PinPoint but on my RKE (which uses a pinpoint probe) you need to wait for the "raw data" to stabalize (with in a certen range) before moving on to the next solution. I'd imagine it's the same with all units to some degree.
3) Try *gently* wiping the probe end with a soft q-tip. Gunk and crud will affect the reading.
4) Check you Alkalinity. (And what type of buffer are you using? Please do include the ingrediants incase I haven't seen it before) If that is low it will exaggerate the natural pH swings.
Give those a shot and see how it goes. Sometimes having too much information can be a bad thing... Honestly, unless there's a problem, it shouldn't be fixed
.
Chris