"Glas-Col Model 099A RD5512 variable speed (.17 to 8.3 rpm) rotator with 099A - RD50 test tube rack. The rack has two 12 inch x 5 inch polyfoam lined retaining plates held by two knurled nuts to allow use with bottles, test tubes, erlenmeyer flasks and other stoppered containers."
American Instrument Exchange, Inc.
1023 Western Avenue
Haverhill, MA 01832