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 Meter Makes Business Smart, Telescopic O Ring Sizing Plastic Gauge, Sliding Style National Type, To Measure O Rings, Inner Diameter, OD, Thickness Gauge Blue

O-Ring Meter Makes Business Smart, Telescopic O Ring Sizing Plastic Gauge, Sliding Style National Type, To Measure O Rings, Inner Diameter, OD, Thickness Gauge Blue

Product ID: 806292431

Details

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

📏Measures ID, OD & thickness precisely

🔵Durable high-quality plastic build

🛠️Telescopic sliding for easy sizing

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€ 71.15

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Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Size it right, every time — because precision means power.

COMPACT PORTABLE - Small, lightweight design with a handy handle—perfect for on-the-go professionals.
RISK FREE PURCHASE - Backed by a no-questions-asked full refund policy for total peace of mind.
EFFORTLESS OPERATION - Telescopic sliding mechanism ensures quick, stretch-free sizing every time.
UNIVERSAL COMPATIBILITY - Supports AS-568 and BS1806 standard O-ring sizes for seamless integration into any project.
PRECISION AT YOUR FINGERTIPS - Accurately measures O-ring inner diameter, outer diameter, and thickness up to 13 inches.

The BUSY-CORNER Telescopic O-Ring Sizing Gauge is a compact, high-quality plastic tool designed for precise measurement of O-ring inner diameter, outer diameter, and thickness. Compatible with AS-568 and BS1806 standards, it features an easy-to-use sliding mechanism and supports sizes up to 13 inches, making it an essential tool for professionals demanding accuracy and portability.

Specifications

ASIN	B08BHR6GG8
Brand	BUSY-CORNER
Brand Name	BUSY-CORNER
Color	blue
Colour	blue
Customer Reviews	4.6 out of 5 stars 141 Reviews
Manufacturer	BUSY-CORNER
Material	Plastic
Material Type	Plastic
Model	o ring gauge blue
Part Number	o ring gauge blue
UPC	722794896965
Unit Count	1.0 Count
Unit count	1.0 Count

Reviews

J**K

O ring gauge

29.12.2025

J**E

Works as intended.

3.03.2025

T**S

Awesome

26.08.2024

F**L

Inaccurate

8.11.2022

C**T

Handy tool

11.01.2023

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