I purchased this item but ended up storing it without using it. It's new and unused, but I have opened the packaging. Here is the PRGR website for the instruction manual: https://saas.actibookone.com/content/detail?param=eyJjb250ZW50TnVtIjoyMDg3NjN9&detailFlg=0&pNo=1 The latest model of the PRGR multi-speed measuring device is the HS-130, but this item is the HS-120. I've listed it at a low price, so I hope you'll feel free to use it. Thank you.