Home / Tools / Leak Locating / The JLS MAG Machine – Visible Edition
Mag Machine Visible Edition 237100 5
Mag Machine Visible Edition 237100 1
Mag Machine Visible Edition 237100 2
Mag Machine Visible Edition 237100 3
Mag Machine Visible Edition 237100 4
Soft Hose and Rubber Plugs for Mag Machine
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Mag Machine Visible Edition 237100 5

The JLS MAG Machine – Visible Edition

Batch Built


The MAG Machine® is the most accurate and reliable leak testing machine in the world, designed to reveal leaks in woodwind and brasswind instruments that cannot be found with other methods such as leak lights and feelers. In addition, it shows the precise degree of leakage in increments on the dial gauge.

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Email when stock available

SKU: BB237100


At its core, this is the same MAG Machine® we’ve always made. Its complex interior has been made accessible throughout its many versions in case it needs repair or parts replaced, but for the first time its interior is now completely visible.

The acrylic siding and 3D printed frame allow for this sleek transparency and a lightweight, but sturdy and budget-conscious product that every technician should own.



237100 Mag Machine Visible Edition Web v2022.9.30

Click for PDF Instructions

Parts Included:

– AC Adapter with Interchangeable Plugs (North America, EU, UK, Australia/New Zealand and China)
– 5 of our most popular Rubber Plugs (Bungs) that are used for flute and clarinet
– JLS Soft Hose for Plug Kits

Shipping & Delivery

Please note: Express & Overnight Shipping deliveries will require a signature. Please ensure someone is available at the delivery address to provide a signature to avoid any issues.

Domestic Shipping
Economy $10.95
FedEx Ground Shipping $15.95
FedEx 2 Day $34.95
FedEx Overnight $44.95
International Shipping Puerto Rico and Guam Canada and Mexico International General
USPS Economy $9.95 $29.95 N/A
USPS Priority Mail International N/A $49.95 $59.95
FedEx International Economy $29.95 $39.95 $44.95
FedEx International Priority $39.95 $49.95 $69.95

Please be aware that orders with certain products may take longer to deliver depending on their stock levels and lead times.

For information about our Return Policy, please check here.

Batch Built FAQ
What is “Batch Built”?
Batch Built is a description we apply to our machined tools that are periodically made in batches.

Each time we make a new batch, the product’s design, function, specifications, and materials are reviewed with the design and production teams. We are constantly improving our tools and finding ways to make them more economically.

Although we work hard to ensure our essential tools, pads, parts and supplies are always available, Batch Built tools are not in stock at all times.

How can I order Batch Built tools?
If a Batch Built tool is out of stock it cannot be ordered, but you can enter your email address on the product page in the field “Email when stock available” and click “Notify Me”.

We don’t want to hold up orders that include Batch Built items if they cannot be delivered, particularly if those items are not yet on our production schedule and have no ETA.

Which items are Batch Built?
Click here to see a full list of Batch Built tools.