For sale: a "3M 222" (actually an X-Rite 301) transmission densitometer. Works perfectly and is in beautiful condition! Table underneath measuring head can be turned on to illuminate film like a light box--this really helps to see and position especially dark and dense negatives! The original calibration materials are long gone. However, all the readings are consistent, stable and agree with a Stouffer step wedge I have (the step wedge in the pictures is not included!) I do have a instruction manual I printed out that I'll send with the densitometer. $40 and USPS Priority mail shipping within the US is included. No PayPal, checks or money orders only please.