Heathkit IB-1101 Frequency Counter Nixie Tube

DataScan MODEL C1200 10 HZ - 1 GHZ FREQUENCY COUNTER Untested with Antenna

Radio Shack 22-305 RF Frequency Counter

SF401 plus 27Mhz-3000Mhz Radio Portable Frequency Counter Meter with CTCCSS DCS

Vintage HEATHKIT Frequency Counter Model IM-4110

Heathkit IM-2400 digital frequency counter Untested

Heathkit IM-4100 Digital Frequency Counter Ham Radio

Heathkit IM-4100 Digital Frequency Counter Powers On Ham Radio Test Gear