Hi Julie:
I actually have not seen this reading before. To me it sounds like an error reading, maybe it didn't have enough blood to get a reading, which can happen often if not used properly. Every glucose meter reader is a little different though. If you still have the owner's manual I would look to see if it shows that reading in there and what it means. If not there usually is an 1-800# to call with each glucose meter. If not, try contacting your pharmacy in which you purchased this item and they may be familiar with your device.
I hope this helps you out.
Take care,
Tara
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