1970s Heathkit Frequency Counter 1M-4100 series U9824. Made in the USA. In pretty good cosmetic condition, with a few surface scuffs and scratches commensurate with age outlet and use. An essential piece of kit for all amateur radio enthusiasts and radio hams.
A manual for this frequency counter is available online from Heathkit's archives: https://archive.org/details/HeathkitIM4100FrequencyCounter
Manufacturer / Brand: Heathkit (Brand), Heath Co. Benton Harbor (MI), USA
Model: Heathkit Frequency Counter IM-4100
Year Launched: 1975
Category: Service or Lab Equipment
Power type and voltageAlternating Current supply (AC) 110/220 Volt, 50/60 Hz, 25 Watt
Dimensions (WHD)18.5 x 7 x 22.5 cm (excluding handles and connectors)
Unpacked weight: 2.1Kg
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Product code: Outlet 1970s Heathkit Frequency Counter 1M-4100 series U9824.