Fully working and in fantastic condition too;

Frequency meter TS175-A/U

85 - 1000 Megacycles

TS175 is for sale at only GBP 45.00 + postage/shipping from the UK

TS175 is for sale at only GBP 45.00 + postage/shipping from the UK

There is a 6 volt inverter for sale that runs this TS-175 Frequency Meter.
See HERE for this very neat and small inverter.