This is a 1966 2-page ad for a Hewlett-Packard Osometers, Model 402 Gas Chromatograph, DY-2801A Quartz Thermometer, Series 810 Chromatograph! The size of the ad is approximately 11x17inches. The caption for this ad is 'When the Chemist turns to Hewlett-Packard' The ad is in great condition. This vintage ad would look great framed and displayed! Add it to your collection today!