It is a engine analyzer for 12 volt ignition systems.
Vintage Sears Engine Analyzer 12V Ignition System In Box, 28-2161 4,6,8 Cyl.
SEARS Engine Analyzer 12v, 282161
Sears Automotive Diagnostic Engine Analyzer 12V USA w/ Cords
VINTAGE Sears Engine Analyzer Model 161 2161 12V Ignition 4~6~8 Cylinders In Box
Sears Engine Analyzer For 12V Systems, Model - 161.216300
Vintage SEARS ENGINE ANALYZER Model 161-2161 Original Box 12V Ignition Systems
