This is the Tech Pack Spec Measurements Sheet template that I used in my "Tech Packs 3" video on my YouTube channel, youtube.com/zoehongteaches.
This template fits industry standards and expectations for spec measurements sheets. (It's up to you to fill it out correctly!)
This listing includes an Excel spreadsheet so you can alter it to fit your needs, and also a PDF of the same so you can just print, photocopy and fill out by hand. In the PDF version, I left a space at the top for you to write in your company contact info (name, address, website, email, phone).
There's also a line that says "Measurements are in _____" and you need to fill in inches or centimeters.