all-sun EM287 Automotive Circuit Breaker Meter Test Device Car Diagnostic Tester

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all-sun EM287 Automotive Test Device car diagnostic tester circuit meter


This item is the best electrical tester for reducing diagnostic time in automotive electrical systems.

After a simple hook-up of the unit to the vehicle battery, automotive technician can conduct a positive or negative battery current to the tip by rocking the rock switch forward or backward.

This item can be used to measure dc voltage and test for continuity or for bad ground contacts.

It can also be used to follow and locate short circuits.

It is short-circuit protected, its long cable allows you to test easily.

This item is powered by the vehicle battery directly.


1.Tests for continuity

2.Tested the polarity of a voltage

3.Measures dc voltage from 2V to 24V

4.Checks lamp

5.Checks electric motor.

6.Follows and locates short circuits.

7.Tests for bad ground contacts



Operation Voltage: 8~24Vdc

Cable Length: about 5m

DC Voltage Measurement Range: 2~24Vdc

Overload Protection: 8A

(When the current exceeds 8A, the unit will disconnect the current automatically.)

Operation Temperature:0~40

Storage Temperature:-20~50

Size: 274x53x42mm(for main body only)

Weight: about 385g



Unroll the unit cable

Clamp the red battery clip to the positive terminal of the vehicle battery.

Clamp the black battery clip to the negative terminal of the vehicle battery

1.Testing the Unit and the Connections

2.Using Illumination

3.Measuring DC Voltage

4.Polarity Test

5.Continuity Test

6.Activating Components out of the Vehicle’s Electrical System

7.Testing Trailer Lamps and Connections

8.Activating Electrical Components

a.Activating components with positive (+) voltage

b.Activating components with negative (-)voltage

9.Jumper Lead Feature

10.Checking for Bad Ground Contacts

11.Following and Locating Short Circuits


We are proud to offer international shipping services that currently operate in over 200 countries and islands world wide. Nothing means more to us than bringing our customers great value and service. We will continue to grow to meet the needs of all our customers, delivering a service beyond all expectation anywhere in the world.

How do you ship packages?

Packages from our warehouse in China will be shipped by ePacket or EMS depending on the weight and size of the product. Packages shipped from our US warehouse are shipped through USPS.

Do you ship worldwide?

Yes. We provide free shipping to over 200 countries around the world. However, there are some locations we are unable to ship to. If you happen to be located in one of those countries we will contact you.

What about customs?

We are not responsible for any custom fees once the items have shipped. By purchasing our products, you consent that one or more packages may be shipped to you and may get custom fees when they arrive to your country.

Do you provide tracking information?

Yes, you will receive an email once your order ships that contains your tracking information. If you haven’t received tracking info within 5 days, please contact us.

My tracking says “no information available at the moment”.

For some shipping companies, it takes 2-5 business days for the tracking information to update on the system. If your order was placed more than 5 business days ago and there is still no information on your tracking number, please contact us.

Will my items be sent in one package?

For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you've specified combined shipping.

If you have any other questions, please contact us and we will do our best to help you out.


Order cancellation

All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.


Your satisfaction is our #1 priority. Therefore, if you’d like a refund you can request one no matter the reason.

If you did not receive the product within the guaranteed time( 45 days not including 2-5 day processing) you can request a refund or a reshipment.
If you received the wrong item you can request a refund or a reshipment.
If you do not want the product you’ve received you may request a refund but you must return the item at your expense and the item must be unused.

  • Your order did not arrive due to factors within your control (i.e. providing the wrong shipping address)
  • Your order did not arrive due to exceptional circumstances outside the control of ULP4U (i.e. not cleared by customs, delayed by a natural disaster).
  • Other exceptional circumstances outside the control of

*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on Contact Us page

If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.


If for any reason you would like to exchange your product, perhaps for a different size in clothing. You must contact us first and we will guide you through the steps.

Please do not send your purchase back to us unless we authorise you to do so.

A few reasons why buy from us:

We try our best to make your shopping experience not only pleasant, seamless and hassle-free, but also secure.

Enjoy flexible international shipping services that currently operate in over 200 countries across the world.

It's okay to change your mind! You can send your order back for a full refund, we've got you covered with our full Buyer protection.

Brand new products are available on a regular basis.

We don't want you to choose between the best value and the best service. That's why we offer competitive pricing.

Knowledgeable and professional support team is always happy to help you.

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