I got a little tired of carting around a bullet level to level my tripod. Id have to put it on one way, level it, rotate it 90 degrees, level again, and go back and forth until it was good. Also carrying around a compass was getting to be annoying as I kept dropping it. I used my phone for both these functions but with the case on it, it wasnt exactly flat or would slide off etc.
I came up with this, a dual axis level that slips right on to the mount and stays snug. It can be rotated a few degrees to ensure you are leveled. There is also a version included that has a compass, so its both tools in one. My set up time now takes seconds and has less things to carry around.

What you will need:
10x10 bubble levels: https://www.amazon.com/dp/B07DMF57KM?psc=1&ref=ppx_yo2ov_dt_b_product_details

Compass: https://www.amazon.com/dp/B009HTFJAQ?psc=1&ref=ppx_yo2ov_dt_b_product_details

Note: I used a touch of super glue gel to keep in the compass and bubble levels.