What Do You Use as a Sun Angle Gauge?

With the EcoFlow setups, I’ve realized panel angle matters a lot more than people think for getting decent output. Everyone seems to have their own little trick for lining things up without overthinking it. I’ve been using a paper towel tube. I just aim it until the shadow basically disappears and it’s pretty close. I’ve also seen people use soup cans or whatever they’ve got on hand to check alignment. What’s your go-to way to get panels pointed right at the sun?