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Hello, John and welcome!
If you are referring to two precision levels similar to those pictured here: https://en.wikipedia.org/wiki/Engineer%27s_spirit_level
they should be permitted in your carry-on baggage. However, it would be a good idea to arrive a little earlier than usual to declare that you have these in your backpack and have the TSA screening agent look at them more carefully, when you go through security to make sure they are permitted. Just in case they should not be, bring a self-addressed, stamped box with you, to mail them back to yourself or to your destination in Canada, if you have no checked luggage and can't put them in there, if you're only traveling with your backpack as carry-on.
I wish you a great trip!
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