What is line impedance?

This is the ac equivalent of dc resistance measuring across the loudspeaker line from “Live” to “Neutral”. The impedance is an indication of load that will be presented to the amplifier and can help estimate the number of loudspeakers connected on that line.


Our Zircle meter is made to the highest quality standards and we know that it will last through thousands of tests. If your Zircle meter stops working in the first two years we will replace it at no charge to you!

What is the ordering procedure?

Step 1 – Go to SHOP and click BUY NOW next to the Zircle. Change quantity if required then click ADD TO BASKET. Your Zircle purchase includes a soft zip case, a battery and a set of test leads with clips (unless otherwise stated). If you wish to purchase extra spares or accessories click ADD TO BASKET under the extras you wish to purchase.

Step 2 – Click on VIEW BASKET. If you wish to change quantities / remove items you can do this here, just click UPDATE BASKET after your changes.

Step 3 – When happy with your basket click PROCEED TO CHECKOUT. You will be asked to add your billing details, alternative delivery details if required and you can also add notes to your order here.

Step 4 – Please read our terms & conditions and tick the box to ACCEPT them.

Step 5 – Click PROCEED TO PAYPAL. Either LOGIN to PayPal if you have an account, or click PAY BY DEBIT OR CREDIT CARD. Follow the PayPal instructions and click PAY NOW. You will receive an email confirming your order.

Step 6 – Once your Zircle is ready for dispatch, you will receive an email confirming the expected delivery date & your tracking information (which will also be added to your PayPal transaction).

How much is Delivery?

Delivery is FREE to all mainland UK addresses. If you wish to order from outside this area, please email us at orders@zircle.co.uk and we can provide you with a quotation.

How quickly will my order be despatched?

We aim to despatch your order within 2 working days of receiving it. A confirmation email will be sent to you with an expected delivery date and your tracking details.

Can I get a Discount?


Buy 4 to 9 and SAVE 10% (you pay £238.50 each)
Buy 10 or more and SAVE 20% (you pay £212 each)

This discount is automatically applied to your basket.

I would like to add to my order, how can I edit my order?

Please email us orders@zircle.co.uk to make any amendments to your existing order.

How can I track my order?

You will receive an email from us with an expected delivery date and your tracking information (which will also be added to your PayPal transaction).

Can I cancel my order and get my money back?

Yes, at any time before we ship and for 90 days after we ship you can cancel. If it is before we ship then we will simply refund any payments you made to us. If we shipped the Zircle just return it and once we get it back you’ll get a full refund, provided it still works. This refund can be claimed up to 90 days after you receive it. To get your refund just return everything we sent you (Zircle, Probes, Crocodile Clips & Zip case, unless otherwise stated).

What if I’ve used the Zircle, can I still get a refund?

Yes, just return everything and provided it still works you’l still get a full refund for up to 90 days after you received it. That means even if the outer case is scratched, cracked or in some other way damaged you will get a full refund provided it still works and provided you send everything back.

How do I cancel my order?

Please email cancel@zircle.co.uk to cancel your existing order. You will receive an email confirming that your order has been cancelled. Your payment will be refunded within 48 working hours of the confirmation email.

My Zircle is faulty

If your Zircle is faulty we will replace it straight away; just send an email to us returns@zircle.co.uk with details of the fault and we will arrange to have faulty unit collected and replaced.

Make measuring & fault finding PAVA & 100 volt loudspeaker circuits easy

Are you struggling to diagnose loudspeaker circuit issues, do you feel exposed and unprepared when called out to a problem PAVA system?

Over half the issues you’ll encounter relate to the 100 Volt loudspeaker circuits. Without an impedance meter you will struggle to identify the problem and will lack confidence in your diagnosis.

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Zircle Pava Test Meter