Circuit Testers

Advanced multi function tester supplied with inter changeable connectors. Voltage supply 8-30V.

A handheld diagnostic tool designed to test circuits / electrical connections.Operates from 3-48V. Includes probe adaptor for testing terminal connections.

An extension cable for the ET0700. Ideal for working on trucks/rear of vehicle.

The perfect electrical circuit test assistant! Get the job done with ease!

Compatible with standard 4 and 5 terminal relay circuits and can be used with most car makes and models. The RelaySim Pro can energise any relay that powers DC electric motors, fuel pumps, cooling fans, blower motors, window motors, and any other motor actuated by a relay), headlights, and other car lighting applications or almost all electrical actuators, such as electromagnetic, electromechanical, and electrohydraulic. Additionally, it can be used in series (in place of a fuse) with most other circuits rated for 25A or less. The device is suitable for both 12-volt and 24-volt systems and does not limit the operating current range. The operating range for continuous usage is up to 21 amps. The device supports a maximum surge of 27 amps, regardless of whether the voltage is 12V or 24V. Two LEDs (85 and 86 terminals) indicate voltage, polarity, and continuity in the relay coil circuit.

RelaySim Pro has a built-in dual high-definition LCD digital display that allows you to observe the current and voltage values in the circuit under test. The device measures the current flowing through the 87 or 87a circuit, depending on which one is currently activated. Also, it measures and displays voltage for circuits 85, 86, 87, 87a, and 30. You can directly observe the amperage and voltage going into an activated circuit, allowing you to assess the load's health. If an actuator is drawing more current than specified, or the current load is inconsistent during operation, the load/actuator is suspect and should be replaced.

• Suits 12V and 24V applications
• Separate control of the 87 and 87a relay circuit
• Integrated a dual high-definition LCD digital display
• Built-in DC ampere meter 0...50A
• Up to 21 amp operating current (for both 12V and 24V applications. See the specs for more details)
• Measurement of the current through the activated circuit
• Built-in DC voltage meter 0...199.9V
• Independent voltage measurement on each relay terminal
• Open load detection in OFF-state
• Flags a fail event (Status LED)

Check circuits on all 6V & 12V systems. 70mm insulated probe, with 3.6m retractable cord.

• 70mm insulated probe
• 3.6m retractable cord

This circuit tester is suitable for use with standard 12V DC systems, as well as newer 42V systems. Safe for low current circuits as it only draws 3 milliamps @ 12V. Crystal clear handle providers excellent all round visibility, even in bright light.

• Automotic voltage identification: 12V (blue LED) | 42V (red LED)
• Two super bright LEDs for excellent visibility in all light conditions.
• Safe for low current circuits

This circuit tester is designed for sensitive circuits such as injector pulse, and automotive computer circuits.

Operates from 3-15V (for 6 - 12V systems). Handle glows red for positive polarity, and green for negative polarity. Supplied with 48" ground wire.

• 3 - 15V voltage range
• 75mm probe length

An innovative tool designed for quick and efficient electrical diagnostics without the need for ground wires or clips. Ideal for testing DC circuits ranging from 3V to 30V. Computer safe.

• No earth lead required - simply touch your body to ground, in order to complete the circuit.
• Dual colour LED indicates Ground (green) or Power (red).
• Suitable for 6V | 12V | 24V systems.
• Internal lithium battery (ER14250) included

A professional quality circuit tester, with an LED display which provides real time voltage (in addition to indicating power (RED) and ground (GREEN)).

This unit has a fixed 90mm probe. See also ET3426A which is a similar tester, but with a standard 4mm connector.

• Spring cable extends to 3 metres
• 6V - 48V DC testing range
• Small testing current (<10mA)
• NOT for use with 240V AC | NOT for use with airbags

Packaged in a BMC, this circuit tester has a standard 4mm connector which can be used with standard multimeter probes.

Wire piercer / probes / alligator clip included.

• Not for use with airbags / vehicle computers.
• For use with DC voltage only.

An essential diagnostic tool for testing potentially faulty electro mechanical relays. This tool tests both 12V / 24V relays, with four / five pins (not late model Ford 4 pin).

Simply plug the relay into the tester - using 12V vehicle power, the relay will be cycled 10 times with the tester applying a signal to the relay coil while checking the function of the internal contacts. The tester applies load to the internal contacts to detect excessive resistance.

• Quickly test 3 common types of electro mechanical relays
• Test relay coil resistance / relay contacts / cyclic testing
• Relay coil resistance: 20 - 500 Ohms
• Test voltage for coil: 9V
• Contact resistance threshold: 200 milliohms

Say goodbye to the guesswork in electrical diagnostics. The ET7386 Short Circuit Diagnostic Kit is a professional-grade solution designed to streamline the process of tracing short circuits in automotive and electrical systems.

Manually Resettable Circuit Breaker Fuses: Includes 7 standard blade and 7 mini blade fuses ranging from 5A to 30A. These fuses trip like conventional ones but can be reset for repeated testing - no need to replace them after each fault.

• 7 standard blade / 7 mini blade resettable fuses
• Fuse ranges: 5A | 7.5A | 10A | 15A | 20A | 25A | 30A
• Includes 2x 300mm extension loops

Replacement straight probe for the ET3426 / ET3426A kits.

Safely test voltage up to 1000V AC / DC. Able to verify the absence of voltage even with discharged batteries.

• Conforms with EN 61243-3. CAT III 1000V / CAT IV 600V
• LED indication range: 12V - 1000V AC / DC
• LCD indication range: 6V - 1000V AC / DC
• Rugged double insulated wire
• Continuity / Diode test
• 2x AAA batteries included

Replacement wire piercing probe for the ET3426 / ET3426A kits.