Hi and welcome!
Am I correct that you are not in the UK? We use mmol/l here, which shouldn't be anywhere near a 100 figure.
So are you talking mg/dL ?
Here is a link to a converter, if you want to see what I mean.
https://www.diabetes.co.uk/blood-sugar-converter.html
If your units are mg/dL then the difference of 100 would be 5.6mmol/l which is a big difference.
There are a few different things that could be going on, and you may have to try several to pin down the problem
- the battery in one of your meters could be going flat
- your hands may have food residue on them, affecting the reading
- you may be using old, out of date strips, or strips that have been left in hot conditions (e.g. a sunny windowsill)
- one of the meters may be faulty
Is your blood glucose high at the moment? Sometimes meters become less accurate in the very high or very low ends of their range.
I would wash and rinse your hands thoroughly, and then re-test your blood with both meters.
And then, as
@helensaramay says, they will still have some variance, simply because the technology is not 100% accurate.