The M-5 is an excellent scale. It was built by Ohaus. It is basically the RCBS 502 with a different base. I have one and I love it. I also have an old Lyman 500(same scale different base), RCBS/Ohaus 505, and RCBS/Ohaus 5-10. If you ever get in to collecting scales you will find one thing most of the better ones have in common. They were/are built by Ohaus.