Using the silhouette printed on the side of the gauge to identify smaller o-rings, do I use the outer or inner silhouette?

Nicholas, your o-ring should completely cover the white part of the silhouette. This is a bit tricky to do by eye. There's more to sizing an o-ring than comparing it to the silhouette. The Busy Corner o-ring gauge you're referencing is made for US sized o-rings. There are also metric, Japanese and British sizes. The only way to be sure of an o-ring's size is to measure the ID, OD and cross section with a caliper. For US o-rings, the numbers printed next to each silhouette on the gauge are called "dash" numbers. O-rings made to AS-568 specifications, no matter who the manufacturer is, will be the same size. So a -105 (dash 105) o-ring will have an inside diameter of .143, an outside diameter of .349 and a cross-section of .103. The first digit of a dash number tells you the cross section in decimal inches. 0 is .070, 1 is .103, 2 is .139, 3 is .210 and 4 is .275. Charts for US, metric, Japanese and British sizes are available on the internet. I likely gave you more info than you requested, but thought it may be of help to others.

does it measure in metric?

No,this oring gauge measure in Imperial(Inch) sizes.

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🔧 Measure with Confidence: The Ultimate O-Ring Gauge!

USER FRIENDLY - Simple slide style for quick and accurate sizing.
DURABLE DESIGN - Crafted from high-quality plastic for long-lasting use.
PRECISION SIZING - Ensure perfect fit for AS568 O-Rings every time.
COMPACT PORTABLE - Easily fits in your toolbox for on-the-go measurements.
VERSATILE APPLICATION - Ideal for professionals in various industries.

The O-Ring Sizing Gauge Slide Style National Type is a precision tool designed for accurately measuring AS568 O-Rings. Made from durable blue plastic, this telescoping gauge is compact, user-friendly, and perfect for professionals seeking reliable measurements in various applications.

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Manufacturer	Delson Rubber & Hardware Tools PTE.LTD
Part number	o ring gauge blue
Item Weight	231 g
Product Dimensions	8 x 38 x 7 cm; 231 g
Item model number	o ring gauge blue
Size	AS568
Colour	Blue
Material	Plastic
Shape	Square
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No

O-Ring Sizing Gauge Slide Style National Type TELESCOPING O-Ring Gauge (Blue)

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