Digital Insulation Tester EM480B Audio Impedance Tester Timer Function Test Ranges 20/200/2000



The EM480B Audio Impedance Tester is a versatile and portable device designed for accurate measurement of speaker system impedance at 1kHz. Ideal for both home theater and commercial sound systems, it features three test ranges (20Ω / 200Ω / 2000Ω) to cater to different testing needs. This uv light meter ensures precise readings with its convenient battery operation and additional functionalities.

  • True measurement of speaker systems actual impedance at 1kHz.
  • Three test ranges (20Ω / 200Ω / 2000Ω) for diverse testing applications.
  • Portable and convenient battery operation.
  • Low battery indication to avoid unexpected power loss.
  • Data hold function to freeze readings for easy recording.
  • Timer function that holds measurements for about 30 seconds after the TEST button is pressed.
  • Auto power-off feature after about 15 minutes of non-use to conserve battery life.

The EM480B can also perform insulation resistance testing with adjustable test voltages (250V, 500V, 1000V), as well as AC voltage, resistance less than 200Ω, and continuity testing. It is commonly used for testing transformers, motors, cables, switches, electrical appliances, and insulation resistance.


Range: 20Ω / 200Ω / 2000Ω 
Resolution: 10mΩ / 100mΩ / 1Ω
Accuracy: ± (2%+2) (or ± 0.1Ω)
Test Frequency: 1kHz
Display: LCD 3 1/2 digits
Power supply: 9V DC (6 x 1.5V AA battery) (Not provided)
Size: 168x110xx62mm
Weight : about 600g

Package includes:

Impedance Tester*1; Test Lead*1 pair; Belt*1; Storage Bag*1; English Manual

Free Shipping

Under normal circumstances we offer free shipping on all orders, you will see the free shipping option in your cart at checkout. There is no choice of carrier for free shipping, but typically we will ship your order will likely ship using either USPS or FedEx. Full Shipping Policy

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.). Full Returns Policy

When Will My Order Ship?

For Standard Shipping, we aim to pack and ship out your order within 3 business days. During special periods, such as heavy order processing or local inventory shortages that require deployment, please expect it to take an additional day or two for processing.
We ship five days a week, Monday through Friday. Sometimes our mail pickup comes in early afternoon, so tracking for orders shipped later that day may not update until the following business day.
You will receive a shipment confirmation with tracking information via email when your order has shipped. Once you receive this email, we cannot change or cancel your order.

Can I Change The Shipping Address On My Order?

Please contact us immediately via email if you realize that you gave us the wrong shipping address — if it hasn't shipped yet, we might be able to correct it before it goes out the door.
If your order ships to the address provided and is returned to us as undeliverable, then you are responsible for paying the cost of shipping again to resend it to you. If you decide you do not want your order reshipped, we'll refund you for the products less the original shipping charges, once your order returns to our warehouse. We'll reach out to you to coordinate your options before re-shipping.
If your order ships to an incorrect address provided at the time the order is placed and is not retrievable, we are not responsible and cannot offer reimbursement.

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Digital Insulation Tester EM480B Audio Impedance Tester Timer Function Test Ranges 20/200/2000
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