The omnipod meter will read HI after 500. We have a one touch for backup that will go to 600. We've had this happen twice. First time was a complete panic. I ran across the street with a backup meter, she was at her dads, called the endo etc. That time it was eating an entire bag of marshmallows and forgetting to bolus. Last time she just went "crap" and showed me her meter. We got out the backup meter just to be sure. Did a manual correction. Waited. Next test was higher. I asked her where she got the bottle of insulin. "Oh I found it at Dads". Oye. Switched out the pod and opened a new insulin bottle. Did another manual correction. Then tested about every 45 mins to an hour until she was back in range. We also tested keytones. This time it was a combo of forgetting to bolus for all of her popcorn, pod that fell out, new pod with bad insulin.