Toneohms gradually expanded from purely PCBA troubleshooting to gain capability to seek out degraded components, leaky capacitors, etc. and extended their role into the world of electronics service and repair. Later in the first decade innovative tools for general purpose troubleshooting emerged.

Milliohmeter Toneohm 400A
Where the journey started – the first audio guided shorts locator, the Toneohm 400A,
whose launch customer was a well known UK Aircraft engine manufacturer

Milliohmeter Toneohm 500A

Milliohmeter Toneohm 500A – improved
With earpiece and replacable plug in probes

Toneohm 3PX210 Short Locator
The Toneohm 500A sold under license
by "The Three Phoenix Corp" in the USA

Contest 100 - Also sold an own brand Toneom 500 under license

Toneohm 600A
Adds capability for current trace on loaded data bus lines.

Toneohm 550
Basic and economical short circuit location

Toneohm 580
Low cost current "sniffer" with hall probe current sense for
detection of leaky comoponents.

Toneohm 700
With tilt bail handle and AC and DC leakage detection
All with audio tone guidance - along with the original
milliohm short circuit location

T1000 Fault Locator and Curve Tracer
Adaptor to convert a basic anaolog oscilloscope
into a transistor curve tracer and V/I
Analog signature troubleshooting tool.
The genesis of a whole range of general purpose fault location tools.

DS102 Digital Oscilloscope
Early DSOs were expensive and had unfamiliar interfaces
The DS102 provided an economic route to adding
DSO capability to the technicians bench at an enconomic price.

Model 12 Continuity Tester
Audio continuity tester with ultra low probe voltage
designed to be "CMOS" safe for the new logic
families which needed treating with respect compared
with the traditional TTL logic.