Yes, I store my tip in a PH 4 solution as advised by the seller on the time of purchase.
Had mine for almost a year now and still going strong.
My PH meter has a plastic cap that i put a bit of solution in to cover the probe then I store it standing upright in the cupboard until I have to use it next. I just rinse it with clean tap water as advised prior to its next use.
I chill my PH sample to 20 degc before measuring which I achieve by placing a small sample in a plastic cup and sitting it in cold water for a few minutes...this gives me the room temp measurement as required to achieve a PH of 5.4 to 5.5.
By doing this I am not relying on the ATC that is built into some PH meters as I have read that this Auto Temp Correction function may only work over a few degrees therefore creating a possible inaccuracy if measuring at mash temp.
At the same time I have read comments from some HB shop suppliers that they say just stick it in the mash.
I leave this to the choice of the individual brewer but I would rather take advice from an actual supplier / manufacturer.
I also keep a note of my additions and PH results with EZ water in Beersmith so I can use the same water profile if I do the same beer again and this way I will be able to tell if there is any discrepancy in the reading indicating that my probe tip may need replacing.
Apology for the rambling post but I hope it may help....all PH meter probes need to be stored correctly otherwise you will have probe failure extremely quickly.
Cheers