Measuring Sticks- Comparing USEF vs others

Trying to avoid the hefty $400 cost of the USEF measuring stick…has any compared their non-USEF stick to the official one? Hoping to find a brand that will give me the same measurement results. Thanks

https://www.valleyvet.com/ct_detail.html?pgguid=30e071e6-7b6a-11d5-a192-00b0d0204ae5&sfb=1&itemguid=32c48838-7b6a-11d5-a192-00b0d0204ae5&utm_content=23942&ccd=IFM003&CAWELAID=120295250000089419&CATARGETID=120295250000182352&cadevice=m&gclid=Cj0KEQjwuZvIBRD-8Z6B2M2Sy68BEiQAtjYS3HhYEedA6pFEMNZ1Skmh-duNfArL9T77lgWibAwz6S0aAuRj8P8HAQ

I have this one, however I have no ponies to measure to worry about. I wouldn’t think there would be a huge difference, seeing as a centimeter is a centtimeter.

I was looking at that same one on Smartpak. I like that it doesn’t fold.
A farm that I worked for had a AHSA stick from the 80’s, when customers would come and bring their own sticks (USEF or other brand) we always got different heights, which was frustrating when trying to sell a tough measuring pony.