Top 2 car circuit testers: YANTEK YD308 and All-Sun EM285

Top 2 car circuit testers: YANTEK YD308 and All-Sun EM285


All-Sun EM285 car circuit tester is preferred in the past, now a newest YANTEK YD308 with new spotlights is released in the market.


Top 1: All-Sun EM285 Car Electric Circuit Tester

Most users prefer All-Sun EM285 to others in the past – Based on sales record and users’ feedback (almost 100% good reviews)

Why? what advantages All-Sun EM285 bring to the user?  

  1. Comes with long cable .
  2. Easy to use: after a simple hook-up of the unit to the vehicle’s battery, automotive technician can conduct a positive or negative battery current to the tip by rocking the power switch forward or backward.
  3. Has short-circuit protection and can test for bad ground contacts instantly.
  4. Allows you to track and locate short circuits.
  5. test for continuity with the assistance of its auxiliary ground lead.
  6. Fit 6-24V DC.


Test for continuity

Test for polarity of a voltage

Check lamp

Check electric motor

Power supply function may be selected

Test for bad ground contacts

How to use All-Sun EM285 Car Electric Circuit Tester?

Polarity testing

Continuity testing

Testing trailer lamps and connections

Checking for bad ground contact

Activating components out of the vehicle’s electrical system.

***Actually, it comes with a detailed instruction manual for your reference.

Top 2: YANTEK YD308 Circuit Tester

A newest YANTEK YD308 Circuit Tester.

YANTEK YD308 wins other similar car testers in the following aspects:

  1. Detect the diode polarity when the car’s ECU is under maintenance
    Help to troubleshoot the electronic parts.

  1. There are 3 modes to supply power in convenience of different situations, to test the current.

Three modes:

Mode 1 (conventional): press to supply power and release to power off
Mode 2: press once to power on and not power off until you press it again (convenient for a long distance from the power supply and the working device)
Mode 3: press once for intermittently supply power (convenient for checking the bulb type flickering effect and it is possible to detect the current at the same time).

3.Optional small voltage output 0-5V is easy to use when repairing ECU electronics and detecting automotive oxygen sensors.

Optional voltage output available: 0-5V available and 0.5V interval each time.

  1. The relay test function is intuitive and convenient, just connect the line according to the diagram color; that is, you can directly test the working condition of the relay.


Is it easy to use YANTEK YD308 Circuit Tester?

– Yes. the package contains one user manual which help user operate in step by step procedure.

– Yes, it contains one 20ft.extension cable which enable user to use easily and freely.