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

Product ID: 806292431

Details

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

📏Measures O-rings up to 33cm (13")

🔄Telescopic sliding gauge for precise sizing

🔵Durable high-quality plastic build

SAR 209

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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 and busy workshops.
EFFORTLESS OPERATION - Telescopic sliding style ensures quick, stretch-free measurements every time—no guesswork needed.
CONFIDENCE GUARANTEED - Backed by hassle-free returns and a 4.7-star rating from 150+ users who swear by its reliability.
UNIVERSAL COMPATIBILITY - Covers a wide range of O-ring sizes from 001 to 475, making it your all-in-one sizing solution.
PRECISION AT YOUR FINGERTIPS - Easily measure inner diameter, outer diameter, and thickness with AS-568/BS1806 standard accuracy.

The BUSY-CORNER O-Ring Meter is a compact, high-quality plastic gauge designed for professional-grade measurement of O-rings. It accurately measures inner diameter, outer diameter, and thickness according to AS-568 and BS1806 standards, accommodating sizes up to 33cm (13") with a telescopic sliding mechanism. Trusted by hydraulic and repair professionals, this tool streamlines O-ring sizing with ease and precision, backed by excellent customer satisfaction and a no-questions-asked return policy.

Specifications

ASIN	B08BHR6GG8
Best Sellers Rank	#517,290 in Fashion ( See Top 100 in Fashion ) #336 in Ring Sizers
Brand	BUSY-CORNER
Brand Name	BUSY-CORNER
Color	blue
Colour	blue
Customer Reviews	4.7 out of 5 stars 151 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

A**R

This tool is great!

This tool is awesome. I never leave reviews but this little gadget is impressive and accurate. I have a hydraulic repair shop and decided to overhaul my oring storage system. I have thousands of o-rings and this tool was invaluable during this process. There is a bit of a learning curve with the amount of tension you put on the oring when reading the size . This handy little tool can read any oring on the dash system from -001- 475. Overall, if you deal with o-rings in any capacity buy it!

12.06.2026

R**4

Works as expected

Bought for work, seems to work fine, hasn’t been used in anger. Bigger than expected

28.05.2026

D**G

Easy to use, accurated to verify an unknown o-ring size.

This gage is like gages I've used at work to identify mystery o-rings. I needed it for some projects and it worked great. Much easier than trying to measure a flimsy o-ring with calipers. I did verify my first couple of tries with calipers and it was right on the money.

23.05.2026

M**E

muy util

espectacular

16.06.2026

J**K

O ring gauge

Great gauge for finding o ring size. Fits in a tool box or bag. Easy to use.

29.12.2025

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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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SAR 209

Duties & taxes included

In stock

Sold byAmazon KSADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to KSA.

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Join PRO →

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TrustScore 4.5 | 7,300+ reviews

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