Best Internal Bore Micrometers

Looking for the best internal bore micrometers? We’ve curated a list of the top 10 options to help you measure with precision and confidence.

Measuring with precision is key in any machining or engineering project. Internal bore micrometers are essential tools for accurate measurements in tight spaces. They ensure reliable results every time.

These tools come in various sizes and designs, each tailored for specific tasks. From small diameters to deep holes, there’s a perfect fit for every need. They are easy to use and built to last.

Whether you’re a professional or a hobbyist, finding the right micrometer can make all the difference. Let’s explore the best options to help you measure with confidence.

List of Top 10 Internal Bore Micrometers

Title	Best For	Price
Shars .472-.630″ Electronic Three-Point Internal Bore Micrometer .00005″ 303-3003 S]	This Shars Electronic Three-Point Internal Bore Micrometer is perfect for anyone needing precise measurements in tight spaces. It’s ideal for machinists, engineers, or hobbyists working with small bores or holes.	View on Amazon (paid link)
Inside Micrometer Set, Internal Diameter Gage Hole Bore 5-30mm Range 0.01mm Accurate + Wrench + Calibration Ring + Wooden Box	This Inside Micrometer Set is perfect for anyone needing precise measurements of holes, depths, or heights in metalworking, engineering, or machining. It’s ideal for professionals or hobbyists who value accuracy and durability.	View on Amazon (paid link)
ALLmeter Digital Bore Gauge 50-160mm (2-6″) – 0.01mm Precision Internal Diameter Measuring Tool with 12 Probes & Case for Engine Cylinders, Automotive and Machining	This ALLmeter Digital Bore Gauge is perfect for mechanics, machinists, and DIY enthusiasts who need precise internal diameter measurements. It’s ideal for engine cylinders, automotive work, and machining tasks, offering accuracy, durability, and portability in one complete toolset.	View on Amazon (paid link)
SHARS .394 – .472″ Electronic 3 Point Internal Bore Micrometer .00005″ New 303-3002 R]	This bore micrometer is perfect for anyone needing precise measurements in tight spaces. It’s ideal for machinists, engineers, or hobbyists working with small parts or deep holes.	View on Amazon (paid link)
SHARS .315 – .394″ Electronic 3 Point Internal Micrometer .00005″ New [0.00005″ Resolution, ±0.00015″ Accuracy] 303-3001 S]	This precision tool is perfect for machinists and engineers who need accurate measurements in tight spaces. It’s ideal for small bores and detailed work.	View on Amazon (paid link)
Shars .984-1.181″ Electronic Three-Point Internal Micrometer .00005″ 303-3006 R	This Shars Electronic Three-Point Internal Micrometer is perfect for anyone needing precise measurements in tight spaces. It’s ideal for machinists, engineers, or hobbyists working with small bores or holes.	View on Amazon (paid link)
Shars 1.968-2.480″ Electronic Three Point Internal Micrometer .00005″ 303-3009 R]	This Shars Electronic Three Point Internal Micrometer is perfect for anyone needing precise measurements in tight spaces. It’s ideal for machinists, engineers, or hobbyists working with small bores or holes.	View on Amazon (paid link)
SHARS 0.472-0.787″ Electronic Three-Point Internal Micrometer .00005″ NEW 303-3014 R]	This SHARS Electronic Three-Point Internal Micrometer is perfect for anyone needing precise measurements in tight or deep spaces. It’s ideal for machinists, engineers, or hobbyists who value accuracy and ease of use.	View on Amazon (paid link)
Starrett Electronic Internal Bore Micrometer with Built-in Bluetooth Technology, Bi-Directional Communication and Precision Ratchet Stop – 5/8-3/4″ Range, .00005″ Resolution – 770BXTZ-750	This Starrett Electronic Internal Bore Micrometer is perfect for anyone needing precise, reliable measurements. Whether you’re in industrial, professional, or consumer markets, this tool ensures accurate readings with its built-in Bluetooth and precision ratchet stop. It’s easy to use and built to last, making it ideal for heavy-duty tasks.	View on Amazon (paid link)
Bolisila Three-jaw Inside Diameter Micrometer Three-Point Bore Internal Measurement Measurement Three-Point Inside Diameter Ruler(Set of 2 12-20mm)	This Bolisila Three-jaw Inside Diameter Micrometer is perfect for anyone needing precise internal measurements. Whether you’re in engineering, machining, or quality control, this tool is easy to use and built to last.	View on Amazon (paid link)

Detailed Reviews

Discover the top 10 Internal Bore Micrometers carefully selected for precision, durability, and value. Each tool is reviewed to meet professional standards, ensuring accurate measurements for your projects. Whether you need affordability or advanced features, this guide has you covered. Dive in to find the perfect micrometer tailored to your needs.

1. Shars .472-.630″ Electronic Three-Point Internal Bore Micrometer .00005″ 303-3003 S]

The Shars Electronic Three-Point Internal Bore Micrometer is a precision tool for accurate measurements. It has a wide measuring range of 0.472-0.63 inches or 12-16 millimeters.

This tool is easy to use with three contact points and a bore depth of 3.15 inches. It provides reliable results with an accuracy of ±0.00015 inches. Simple and clear, it’s a great choice for precise work.

Pros	Cons
Precise measurements with ±0.00015″ accuracy for reliable results. Versatile range: measures 0.472″ to 0.63″ bores effortlessly. Three-point contact ensures stable and consistent readings. Deep bore reach of 3.15″ for hard-to-access areas.	Limited measuring range for larger bores. No wireless or digital display option. Requires careful handling to maintain accuracy.

Perfect For:

This Shars Electronic Three-Point Internal Bore Micrometer is perfect for anyone needing precise measurements in tight spaces. It’s ideal for machinists, engineers, or hobbyists working with small bores or holes.

Ready to Purchase?

View Price on Amazon (paid link)

2. Inside Micrometer Set, Internal Diameter Gage Hole Bore 5-30mm Range 0.01mm Accurate + Wrench + Calibration Ring + Wooden Box

Measure with precision using this Inside Micrometer Set. It’s perfect for internal diameter gages with a 5mm to 30mm range. The 0.01mm accuracy ensures reliable results.

Made from premium stainless steel, this kit is durable and wear-resistant. The chrome-plated surface adds extra protection, ensuring a longer service life.

The set includes a micrometer, wrench, calibration ring, and wooden box. It’s ideal for measuring holes, depth, and height in workpieces. Easy to use and store for all your projects.

Pros	Cons
Precision measuring with 0.01mm accuracy for perfect results. Durable stainless steel ensures long-lasting performance. Complete kit includes wrench, calibration ring, and wooden box. Versatile tool for measuring holes, depths, and heights.	Limited range (5-30mm) may not suit all measuring needs. No digital display, requires manual reading for accuracy. Calibration ring needed for precise adjustments, adds extra step.

Perfect For:

This Inside Micrometer Set is perfect for anyone needing precise measurements of holes, depths, or heights in metalworking, engineering, or machining. It’s ideal for professionals or hobbyists who value accuracy and durability.

Ready to Purchase?

View Price on Amazon (paid link)

3. ALLmeter Digital Bore Gauge 50-160mm (2-6″) – 0.01mm Precision Internal Diameter Measuring Tool with 12 Probes & Case for Engine Cylinders, Automotive and Machining

The ALLmeter Digital Bore Gauge is a precision tool for measuring internal diameters. It offers 0.01mm accuracy and works for sizes from 50mm to 160mm (2-6 inches). Perfect for engine cylinders, automotive, and machining tasks.

This kit includes 12 probes and a high-quality ABS case. The chrome-plated handle ensures durability and easy transport. It’s self-centering and measures depths up to 150mm without disassembly.

Quick, reliable, and portable. Ideal for workshops and job sites. A complete solution for all your measuring needs.

Pros	Cons
0.01mm precision ensures accurate and reliable measurements every time. 12 probes and accessories offer a complete measuring solution. Chrome-plated handle and ABS case provide durability and portability. Self-centering design guarantees consistent geometric diameter measurements. No disassembly required saves time during engine rebuilds.	No battery included, requires separate purchase for operation. Limited range for larger diameter measurements beyond 160mm. Higher price compared to basic bore gauge models.

Pros

Cons

0.01mm precision ensures accurate and reliable measurements every time.
12 probes and accessories offer a complete measuring solution.
Chrome-plated handle and ABS case provide durability and portability.
Self-centering design guarantees consistent geometric diameter measurements.
No disassembly required saves time during engine rebuilds.

No battery included, requires separate purchase for operation.
Limited range for larger diameter measurements beyond 160mm.
Higher price compared to basic bore gauge models.

Perfect For:

This ALLmeter Digital Bore Gauge is perfect for mechanics, machinists, and DIY enthusiasts who need precise internal diameter measurements. It’s ideal for engine cylinders, automotive work, and machining tasks, offering accuracy, durability, and portability in one complete toolset.

Ready to Purchase?

View Price on Amazon (paid link)

4. SHARS .394 – .472″ Electronic 3 Point Internal Bore Micrometer .00005″ New 303-3002 R]

The SHARS .394 – .472″ Electronic 3 Point Internal Bore Micrometer is a precision tool for measuring internal diameters. It offers accurate readings with a resolution of .00005″, making it ideal for detailed work.

This micrometer includes a 3.937″ extension rod for deep hole measurements and a setting ring for easy calibration. It also features an auto shut-off after 5 minutes to save battery life.

Key highlights: SPC data port, retain current measurement, and minimum range of 0.394″. Perfect for professionals needing reliable tools.

Pros	Cons
Auto shut-off saves battery life and keeps measurements ready. Setting ring ensures easy calibration for accurate results. Extension rod measures deep holes effortlessly. SPC data port allows seamless data transfer (cable sold separately).	No cable included for SPC data port. Limited range for smaller bores. Extension rod may be too short for some deep holes.

Perfect For:

This bore micrometer is perfect for anyone needing precise measurements in tight spaces. It’s ideal for machinists, engineers, or hobbyists working with small parts or deep holes.

Ready to Purchase?

View Price on Amazon (paid link)

5. SHARS .315 – .394″ Electronic 3 Point Internal Micrometer .00005″ New [0.00005″ Resolution, ±0.00015″ Accuracy] 303-3001 S]

The SHARS Electronic 3 Point Internal Micrometer is a precision tool for accurate measurements. It offers a resolution of 0.00005″ and ±0.00015″ accuracy, ensuring reliable results.

With a measuring range from 0.315″ to 0.394″, this micrometer is ideal for small bores. Its 1.73″ bore depth and 0.31496″ setting ring make it a versatile choice.

Easy to use, durable, and precise. A must-have for quality work. SHARS Tool delivers exceptional performance.

Pros	Cons
Precise measurements with 0.00005″ resolution for accurate results. Wide range measures from 0.315″ to 0.394″ effortlessly. Durable build ensures long-lasting performance and reliability. Easy to use with a setting ring for quick calibration.	Limited measuring range for larger bores. No wireless or digital display features. Requires careful handling for precise measurements.

Perfect For:

This precision tool is perfect for machinists and engineers who need accurate measurements in tight spaces. It’s ideal for small bores and detailed work.

Ready to Purchase?

View Price on Amazon (paid link)

6. Shars .984-1.181″ Electronic Three-Point Internal Micrometer .00005″ 303-3006 R

The Shars Electronic Three-Point Internal Micrometer is a precision tool for measuring small diameters. It has a measuring range of 0.984-1.181 inches (25-30mm), making it ideal for tight spaces. Its bore depth of 3.54 inches allows for deep measurements.

This tool features three contact points for accurate readings. It includes a setting ring of 0.9843 inches for easy calibration. The accuracy is ±0.00015 inches (0.004mm), ensuring reliable results.

With its simple design and clear display, this micrometer is easy to use. It’s a must-have for precision work in machining or engineering.

Pros	Cons
Precise measurements with ±0.00015″ accuracy for reliable results. Versatile range: measures 0.984-1.181″ bores with ease. Three-point contact ensures stable and consistent readings. Deep bore depth of 3.54″ for hard-to-reach areas.	Limited measuring range for larger bores. No digital display for quick readings. Manual calibration needed for accuracy.

Perfect For:

This Shars Electronic Three-Point Internal Micrometer is perfect for anyone needing precise measurements in tight spaces. It’s ideal for machinists, engineers, or hobbyists working with small bores or holes.

Ready to Purchase?

View Price on Amazon (paid link)

7. Shars 1.968-2.480″ Electronic Three Point Internal Micrometer .00005″ 303-3009 R]

The Shars Electronic Three Point Internal Micrometer is a precision tool for accurate measurements. It has a measuring range of 1.968-2.480 inches and a bore depth of 5.

This tool offers high accuracy with ±0.0002 inches precision. It has three contact points and a setting ring at 2.4410. Perfect for detailed work.

Pros	Cons
Precise measurements with ±0.0002″ accuracy for reliable results. Wide measuring range: 1.968-2.480″ for versatile use. Three contact points ensure stable and accurate readings. Deep bore depth of 5 for hard-to-reach measurements.	Limited measuring range for larger projects. No digital display for quick readings. High precision may require skilled handling.

Perfect For:

This Shars Electronic Three Point Internal Micrometer is perfect for anyone needing precise measurements in tight spaces. It’s ideal for machinists, engineers, or hobbyists working with small bores or holes.

Ready to Purchase?

View Price on Amazon (paid link)

8. SHARS 0.472-0.787″ Electronic Three-Point Internal Micrometer .00005″ NEW 303-3014 R]

The SHARS Electronic Three-Point Internal Micrometer is a precision tool for measuring small diameters. It has a minimum range of 0.472 inches and is easy to calibrate with the included setting ring. The auto shut-off feature saves battery life.

It includes a long extension rod for deep hole measurements and has an SPC data port for easy data transfer. The connection cable is sold separately.

Pros	Cons
Auto shut-off saves battery life and keeps measurements ready. Setting ring makes calibration quick and hassle-free. Extension rod lets you measure deep holes with ease. SPC data port allows easy data transfer for precision work.	No cable for SPC data port included, must buy separately. Limited range (0.472″ to 0.787″) may not fit all needs. Auto shut-off could reset if thimble moved accidentally.

Perfect For:

This SHARS Electronic Three-Point Internal Micrometer is perfect for anyone needing precise measurements in tight or deep spaces. It’s ideal for machinists, engineers, or hobbyists who value accuracy and ease of use.

Ready to Purchase?

View Price on Amazon (paid link)

9. Starrett Electronic Internal Bore Micrometer with Built-in Bluetooth Technology, Bi-Directional Communication and Precision Ratchet Stop – 5/8-3/4″ Range, .00005″ Resolution – 770BXTZ-750

Starrett Electronic Internal Bore Micrometer with Built-in Bluetooth Technology, Bi-Directional Communication and Precision Ratchet Stop - 5/8-3/4

The Starrett Electronic Internal Bore Micrometer is a heavy-duty tool with a 5/8-3/4″ range and .00005″ resolution. It features built-in Bluetooth for bi-directional communication and an IP67 protection level against coolant, water, dirt, and dust.

It’s easy to read, thanks to a large LCD display and precision ratchet stop. The quick-adjusting tool makes it perfect for fast, accurate work.

This micrometer meets strong demands with reliable performance and long-lasting quality. Starrett tools exceed accuracy standards, making them ideal for industrial and professional use.

Pros	Cons
Wide range without changing anvils, saves time and effort. Built-in Bluetooth for wireless data transfer, easy connectivity. IP67 protection against coolant, water, dirt, and dust. Precision ratchet stop ensures accurate, consistent measurements.	High price may not fit all budgets. Bluetooth requires compatible devices for full use. Complex setup for beginners to master quickly.

Perfect For:

This Starrett Electronic Internal Bore Micrometer is perfect for anyone needing precise, reliable measurements. Whether you’re in industrial, professional, or consumer markets, this tool ensures accurate readings with its built-in Bluetooth and precision ratchet stop. It’s easy to use and built to last, making it ideal for heavy-duty tasks.

Ready to Purchase?

View Price on Amazon (paid link)

10. Bolisila Three-jaw Inside Diameter Micrometer Three-Point Bore Internal Measurement Measurement Three-Point Inside Diameter Ruler(Set of 2 12-20mm)

Bolisila Three-jaw Inside Diameter Micrometer Three-Point Bore Internal Measurement Measurement Three-Point Inside Diameter Ruler(Set of 2 12-20mm)

The Bolisila Three-jaw Inside Diameter Micrometer is a reliable tool for precise measurements. It’s perfect for engineering, machining, and quality control.

This set of 2 micrometers covers 12-20mm sizes, meeting diverse needs. Its user-friendly design ensures quick and easy use.

High-quality materials make it durable. Accurate results in demanding environments. Ideal for professionals.

Pros	Cons
Accurate measurements for engineering and machining. User-friendly design for quick and easy use. High-quality materials for durability in tough conditions. Versatile sizes to fit diverse measurement needs.	Limited range (12-20mm) may not suit all measurement needs. No case included for storage or protection. Higher cost compared to basic micrometers.

Perfect For:

This Bolisila Three-jaw Inside Diameter Micrometer is perfect for anyone needing precise internal measurements. Whether you’re in engineering, machining, or quality control, this tool is easy to use and built to last.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Choosing the right internal bore micrometer is key for accurate measurements. This guide helps you find the best tool for your needs.

Here’s what to consider when buying:

Measuring Range: Pick a micrometer with a range that matches your project needs. Too small or large won’t work well.
Accuracy: Look for tools with high accuracy, like ±0.00015 inches, for reliable results.
Ease of Use: Choose tools with clear displays and simple designs for quick measurements.
Durability: Go for stainless steel or chrome-plated tools that last longer and resist wear.
Depth Capability: Ensure the micrometer can measure the depth of your holes or bores.
Calibration: Tools with setting rings or calibration tools make adjustments easy.
Portability: Lightweight and compact designs are great for job sites or workshops.
Extras: Kits with probes, cases, or wrenches add value and convenience.

With these factors in mind, you’ll find the perfect micrometer for your work. Measure with confidence every time!