I had this issue when my BG machine packed up. It was New Years Eve and the machine got stuck on one reading, which said I was 3.2, so I treated the hypo twice and then by third reading and feeling very ill I realised the machine was broken :roll:
Luckily back then I was on MDI and we muddled through until the shops opened for me to buy a new machine. At the pump course I was given a ketone meter, which can do BG as well. I always have a pack of the BG strips for that as a back up. Scary how much we rely on machines now!! :lol: