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 Gauge Make Work Smart, Telescoping O Ring Sizing Plastic Gauge, Slide Style National Type, for Measuring O Rings Inner Diameter, OD, Thickness Gauge Blue

Product ID: 218137412

Details

Brand
BUSY-CORNER
Color
Blue
Material
Plastic
Nominal Inside Diameter
13 Inches
UPC
722794896965

📏13-inch max ID precision

🔄Telescoping slide for easy sizing

🔵Durable high-quality plastic

₩76816

Duties & taxes included

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Description

🔧 Size it right, every time — because precision is power!

COMPACT PORTABLE - Small, lightweight design fits perfectly in your toolkit or pocket for on-the-go professionals.
EFFORTLESS OPERATION - Slide-style gauge lets you size O-rings quickly without stretching or guesswork.
TRUSTED QUALITY SUPPORT - Crafted from premium plastic by BUSY-CORNER with a 4.7-star rating and dedicated customer service.
PRECISION AT YOUR FINGERTIPS - Measure O-rings up to 13 inches ID with exact AS568/BS1806 standard sizing.
MULTI DIMENSIONAL MEASUREMENT - Accurately gauges inner diameter, outer diameter, and thickness in one tool.

The BUSY-CORNER Telescoping O-Ring Gauge is a compact, high-quality plastic tool designed for precise measurement of O-rings’ inner diameter, outer diameter, and thickness. Compatible with AS568 and BS1806 standards, it features a slide-style mechanism for effortless sizing up to 13 inches, making it an essential gadget for professionals demanding accuracy and convenience.

Specifications

ASIN	B08BHR6GG8
Best Sellers Rank	#33,188 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #21 in Thickness Gauges
Brand Name	BUSY-CORNER
Color	Blue
Customer Reviews	4.7 4.7 out of 5 stars (163)
Manufacturer	BUSY-CORNER
Material Type	Plastic
Model	o ring gauge blue
Nominal Inside Diameter	13 Inches
Part Number	o ring gauge blue
UPC	722794896965
Unit Count	1.0 Count

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