Guth Laboratories Model 10-4 Alcohol Simulator Test Calibrator

Guth Laboratories Model 10-4 Alcohol Simulator Test Calibrator in good physical condition with minor scratching from general use (see picture). Unit powers on, power and heater lights light up, not able to test further. Not sure the calibration is still correct but each one has a dated calibration sticker from 2000-2009. ALL QUESTIONS AND OFFERS WELCOME