In good condition, the 625 coin cell battery is flat (think is only used to test ohms). Decent new ones are available on Amazon for about £3.
HoldPeak Automotive Multimeter Voltmeter Tachometer Dwell RPM Ohm Digital Tester
Tachometer For Car 8000 RPM Gauge Tachometer 55mm Diameter For 1 To 8 Cylind DTS
Gunsons Pocket meter 1 Digital General Purpose Multimeter Deadstock
Gunsons 77108 Solar Powered 12V Battery Charger
1970's Gunsons Professional Timing Light
Gunsons Supastrobe Xenon Advance Timing Light With Inductive HT Pick-Up
