It is manufactured by HeathKit and has a manufacturer part number of CL-1040. The timing light is designed for diagnosing and adjusting ignition timing on vehicles.
Vintage HeathKit Timing Light CL-1040
Vintage HeathKit Timing Light CL-1020 12 V Untested
Vintage HeathKit Timing Light CL-1020 12 Volt Systems
Vintage Automotive Timing Light, Milton # 1241 DC power timing light
Nos Vintage RAC Timing Light No 1537 Made In The USA Rite Autotronics 1972
Vintage PENSKI TIMING LIGHT! Metal! Beautiful Condition!