RACAL 836 Universal Frequency Counter 32Mhz with 6 Digit Nixie Vintage – Marten Electric @ Blog
Tube Time on Twitter: "Sunday afternoon mini-project: fixing my Nixie tube frequency counter. symptoms: it won't count, and something is wrong with one of the digits. https://t.co/0nSQGW1PIF" / Twitter
Making classic frequency counters into Nixie clocks | Evil Mad Scientist Laboratories
TC* HP HEWLETT 5245L Nixie Tube Frequency Counter + 5265A Voltmeter (KUP22) | eBay