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Model 917 calibrator provides a complete test of the entire speedometer/recorder system, including axle drive assembly. It is designed to accept all makes, models and paddle lengths. The operator's station for cab use has 1-inch digital display. A 25-foot cable allows testing at either side of cab. Accuracy to plus/minus 1/10 mph. Large 8-inch wheels on calibrator for easy movement. Safety relay interlock prevents accidental startup. 3-position selector switch allows testing in forward or reverse. Calibrator has enclosure built-in to store all components when not in use, 115 VAC power and limited two-year warranty.