Review on Igaging Digital Protractor with 📐 Stainless Bladed Precision for Accurate Angles by Jack Bhowmik

I've only used this for baseball estimates, they've never held the zero very well and I've had good luck getting them to do so able to read 90 degrees a known good 90 degree angle. I used it for a while when I first got it and occasionally since then. But since it can't be relied on, I rarely use it for anything other than a quick review. I'm not even sure how much I paid for them but they aren't worth the $20 they charge and it's down to chance. Maybe the quality has improved since you bought it, I can assure you I won't be buying this again.