Abstract: A transporter for conveying articles through a testing or monitoring station. Movement of articles through the test station is controlled at predetermined spaced intervals, and the article is stabilized during monitoring to obtain accurate test data. A reject mechanism, operative in response to the monitoring of the object, is provided to eject any object which is determined to vary from predetermined test limits. The transporter is especially suitable for use in the food processing industry to monitor both positive and negative pressurized containers passing therethrough.