Best Inside Micrometres of 2026

Name: Mitutoyo 137-204 Inside Micrometre 50 mm-1000 mm
Brand: Mitutoyo

Kenneth Collin

Last Updated: 2 Feb 2026

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Inside micrometres are precision measuring instruments that are used to measure the internal dimensions of objects with high accuracy. They are commonly used in engineering, manufacturing, and quality control to ensure that products meet precise specifications. Inside micrometres come in a range of sizes and styles to accommodate different applications and can measure dimensions such as bore diameter, groove width, and distance between two internal surfaces. Their accuracy and ease of use make them an essential tool for professionals who require precise measurements for their work.

At a Glance: Our Top Picks

#TOP 1

Mitutoyo 137-204 Inside Micrometre 50 mm-1000 mm

9.9

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#TOP 2

Mitutoyo 137-214 Tubular Inside Micrometre 2"-40"

9.8

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#TOP 3

Mitutoyo 137-203 Tubular Inside Micrometre 50-500 mm

9.6

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Top 6 Inside Micrometres

#TOP 1

Mitutoyo 137-204 Inside Micrometre 50 mm-1000 mm

Mitutoyo
137-204
Mehrfarbig

Mitutoyo 137-204 Tubular Inside Micrometre, Range 50 mm-1000 mm

The Mitutoyo Inside Micrometre is designed for precision measurement within the range of 50 mm to 1000 mm. It comes supplied in a fitted plastic case, ensuring that your tool is safely stored and easily transportable. This feature provides convenience when you need to take measurements on the go. Additionally, the series includes various case options, such as wooden cases for larger models, which offer a more durable and professional presentation. This adaptability caters to different user preferences and environments.

9.9

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What We Like

High precision measurements
Portable fitted plastic case
Durable wooden case option
Wide measurement range

#TOP 2

Mitutoyo 137-214 Tubular Inside Micrometre 2"-40"

Mitutoyo
137-214
2-40"

Mitutoyo 137-214 Tubular Inside Micrometre, Range 2"-40"

The Mitutoyo Inside Micrometre 137-214 is a precision tool designed for measuring internal diameters. This model comes in a fitted plastic case, ensuring safe storage and easy transportation. The range of 2"-40" allows you to tackle a variety of measuring tasks, making it versatile for different projects. Furthermore, the high-quality construction of Mitutoyo tools assures reliability, so you can trust the measurements you take. This combination of durability and convenience makes this micrometre an excellent choice for anyone needing precise internal measurements.

9.8

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What We Like

Precision measuring tool
Comes in fitted case
Wide measurement range
Reliable construction

#TOP 3

Mitutoyo 137-203 Tubular Inside Micrometre 50-500 mm

Mitutoyo
137-203
Mehrfarbig

Mitutoyo 137-203 Tubular Inside Micrometre, Range 50 mm-500 mm

The Mitutoyo Inside Micrometre is designed for precision measurements in a range from 50 mm to 500 mm. It comes in a fitted plastic case, ensuring that your tool is well-protected and easily accessible when you need it. This convenient casing allows you to transport the micrometre safely, making it ideal for both workshop and field use. Additionally, the series is known for its reliability, which means you can trust the accuracy of your measurements every time.

9.6

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What We Like

Precision measurement capability
Fitted plastic case included
Reliable and accurate readings
Portable for various uses

#TOP 4

Starrett 824E Fixed Range Inside Micrometre

Starrett
824E
7-8"

Starrett 824E Fixed Range Vernier Inside Micrometre, 7-8" Range, 0.001" Graduation, +/-0.0001" Accuracy

The Starrett 824E Micrometre is designed for precision when measuring inside dimensions. Its vernier scale in inch units enables you to take accurate readings effortlessly. The adjustable sleeve and contacts allow for fine-tuning, ensuring that your measurements are spot on every time. With a knurled ring-type lock nut, you can secure your measurements, providing peace of mind during use. Additionally, the satin chrome finish not only resists rust but also reduces glare, making it easier for you to read the measurements.

9.4

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What We Like

Highly accurate measurements
Easy to read vernier scale
Secure measurement locking
Rust-resistant finish
Comfortable heat-insulated handles

#TOP 5

Mitutoyo 137-205 Tubular Inside Micrometre, Range 50 mm-1500 mm

Mitutoyo
137-205
Mehrfarbig

Mitutoyo 137-205 Tubular Inside Micrometre, Range 50 mm-1500 mm

Features

Series 139 Supplied In Fitted Wooden Case Except 500mm/20in Come In Plastic Case
Series 137 Supplied In Fitted Plastic Case Except 1550mm/60in Come In Wooden Case
Series 140 Supplied In Fitted Wooden Case

9.3

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#TOP 6

Mitutoyo 177-297 4" Inside Micrometre Setting Ring

Mitutoyo
177-297

Mitutoyo 177-297 Setting Ring for Inside Micrometre, Holtest and Dial Bore Gage, Inch, 4" Size

The Mitutoyo 177-297 Setting Ring is designed for use with inside micrometres, holtests, and dial bore gauges. It measures in inches and has a size of 4 inches, making it a versatile tool for precise internal measurements. This setting ring allows you to achieve accurate calibrations, ensuring that your measurements are reliable. With its compatibility and precise sizing, you can enhance your measuring tasks, bringing convenience and efficiency to your work.

9.2

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What We Like

High precision measurements
Compatible with various tools
Convenient 4" size
Inch measurement standard

Frequently Asked Questions (FAQs)

1. What is an inside micrometer?

The inside micrometer is the most direct measuring tool used for inspection (Figure 1). The total length of the inside micrometer is itself the overall length being measured. The inside micrometer is a much more accurate measuring tool for inside measurement than the caliper.

2. What is inside micrometer caliper?

An inside micrometer is a device designed to precisely measure things such as the inner diameter of holes. Where a standard micrometer might be used to measure the outer diameter of a bolt, an inside micrometer could be used to measure the inner diameter of a nut.

3. How do you calibrate an internal micrometer?

Select two standard ring gages within the range of the IUT. Insert the probe end of the IUT into the ring gage. Rotate the micrometer on the end of the IUT until contact is made with the standard ring. Continue to rotate the micrometer spindle until the ratchet clicks a minimum of three times.

Editor's Notes

During our inside micrometre research, we found 14 inside micrometre products and shortlisted 6 quality products. We collected and analyzed 2,239 customer reviews through our big data system to write the inside micrometres list. We found that most customers choose inside micrometres with an average price of £313.84.

The inside micrometres are available for purchase. We have researched hundreds of brands and picked the top brands of inside micrometres, including Mitutoyo, Starrett.

Written by

Kenneth Collin

Kenneth Collin graduated from Imperial College, London, at 22. He is a UX/UI designer, a web developer, and a writer, amongst others. At age 14, Kenneth programmed his first app. Kenneth's app served as a remote control for censored devices. "When I was 8, I would pick up scraps from electronics and try to rebuild or at least fix them," Kenneth said in one of his recent articles on Home repairs for top gadgets.