TL-dif Differential Test Lead


The differential test lead offers oscilloscope channels galvanic isolation, allows safe, accurate measurement between two voltage points where neither is referenced to ground. Can be connected to crankshaft position sensor, electric generator windings, internal circuits of engine control unit.

Key Features


ROTKEE (Ukraine)

Operating voltage

no more than 60 V

Removable lead connector

4 mm “banana”

Output connector


Total length

2.5 m

Operating temperature range

-20 to 80℃


195 g


Video Lessons

Diagnosing a starting and charging system with an example of Subaru Imreza. Connection TL-dif test leads to starter and  alternator being tested. (8:38)



Contents of delivery

  • A differential test lead - 1 pc
  • A plunger test hook probe - 2 pcs
  • An alligator clip probe - 1 pc
TL-dif Differential Test Lead contents delivery

The Test Lead Design

The differential test lead is specially designed for making measurements in internal combustion engines. A soft microphone cable with a dense braided shield is used as a cord. 4 mm "Banana" plugs are used as test lead connectors; BNC is a test lead - oscillograph connector.

With the help of a standard 4 mm Banana plug you can easily connect/disconnect/change test probes. This plug is compatible with test probes from other manufacturers as well as multimeters. Socket function is marked on the housing end.

If needed, the mini hook lead probe can be replaced by a flexible pin or an alligator clip.

TL-dif Test Lead pinout

The removable probes are made of a flexible PVC cable. A plunger test hook is ideal for connecting an oscillograph to automotive wires, connectors, PCB pads and other recessed areas.

When designing the test lead, high emphasis has been placed on a signal cables joint as this junction is damage-prone. Each of these joints includes a circuit board with the test lead’s electronic components. The board not only supports the loads, but also fixes the cable. Such solid joints prevent cable breakdown and increase its durability.

The test lead is compatible with the MT Pro motor tester as well as any other oscillograph. It can be connected to any analog channel.