For sale is a used Roller-Smith / Arthur S. LaPine 500 MG Precision Balance  Scale in good condition. I am not sure how to operate this unit but could learn if bidder would teach. I purchased this from a local Northwest Ohio school in as is condition. Die cast aluminum construction with folding dust doors. Nothing broken I can see, I vevelled it out with the 3 adjustable feet. Please feel free to call 419-576-2165 or email questions.