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

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

Product ID: 436393252

Details

Brand
BUSY-CORNER
Colour
Blue
Material
Plastic
Nominal outside diameter
13 Inches
UPC
722794896965

👜Compact & portable slide design

📏Measures O-rings size 001-475

🔵Durable high-quality blue plastic

€ 59.53

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Description

🔧 Size it right, every time — don’t let your O-rings hold you back!

COMPACT POWERHOUSE - Small, lightweight design fits perfectly in your toolkit or pocket
EFFORTLESS OPERATION - Slide-style gauge with intuitive tension method for quick, reliable sizing
UNIVERSAL COMPATIBILITY - Covers a wide range of O-ring sizes from 001 to 475, ideal for hydraulic & industrial use
TRUSTED QUALITY SUPPORT - Backed by BUSY-CORNER’s commitment to durability and responsive customer service
PRECISION AT YOUR FINGERTIPS - Accurately measures inner, outer diameter & thickness for AS568/BS106 O-rings

The BUSY-CORNER O-Ring Sizing Gauge is a compact, slide-style measuring tool crafted from durable blue plastic. Designed for professionals managing AS568/BS106 standard O-rings, it accurately measures inner diameter, outer diameter, and thickness across sizes 001 to 475. Its portable design and easy-to-use sliding mechanism make it an essential gadget for hydraulic repair shops and industrial toolkits, ensuring precise O-ring sizing with minimal effort.

Specifications

ASIN	B08BHR6GG8
Best Sellers Rank	122,671 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 3 in Ring Gauges
Brand	BUSY-CORNER
Colour	Blue
Customer Reviews	4.6 4.6 out of 5 stars (131)
Manufacturer	Delson Rubber & Hardware Tools PTE.LTD
Manufacturer Part Number	o ring gauge blue
Material	Plastic
Model Number	o ring gauge blue
Nominal Outside Diameter	13 Inches
Number of Items	1
Set Name	O-Ring Set
UPC	722794896965
Unit Count	1.0 count

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