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Products verified: June 4, 2026
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Selecting the right comparator is crucial for accurate and reliable measurements in laboratory and industrial settings. These instruments are designed to provide precise comparisons, ensuring consistency and quality control in various applications. Investing in a high-quality comparator tailored to your specific needs will prevent costly errors and improve overall operational efficiency.
Ultimate Precision for Every Caliber: The AltitudeCraft bullet and headspace gauge comparator kit is designed to cater to a wide range of calibers from .17" to .45" and headspace sizes up to E420. With 14 inserts and 6 bushings, this comparator reloading...
Ensure Consistency: Measuring cartridge lengths at the bullet tips is unreliable and often varies by up to .025” between rounds. The bullet comparator measuring tool equipment provides consistent and precise measurements by measuring from the ogive...
Innovative Design for Enhanced Accuracy: The dual-screw design of the bullet comparator body enables seamless connection to your caliper blade, eliminating the need for a third hand to obtain accurate measurements. Inserts are color-coded and feature a...
Engineered for Durability and Ease of Use: Crafted from high-quality 6061 aluminum, the bullet and headspace gauge comparator measuring tool ensures longevity and reliability. A sturdy tin case securely holds all components, offering protection and easy...
What's Included in the Comparator Reloading Set: The kit includes the comparator body, 14 inserts for bullet diameters 172, 204, 224, 243, 257, 264, 277, 284, 308, 338, 358, 375, 416, and 458, and 6 bushings for sizes A.330, B.350, C.375, D.400, E...
Screw-on bushing design. Stainless Steel bushing holding body. Better concentricity and consistency than the H brand or others
High-grade CNC machining ensures precise, consistent, and beautifully finished parts
Color-coded bushings with a ceramic-like Type II hard anodic coating provide a durable finish and make it easy to identify calibers for user convenience
A nice tin box is included for convenient bushing storage
Headspace gauge bushings were individually pin-checked with Go=-12μm(-half thou), No-Go=+12μm(+half thou)
We're a small business from Australia called Derraco Engineering. We take our time designing and making our products, making sure we do it right without taking any shortcuts. We hope that once you try our stuff, you'll remember our name.
Our bullet comparator bushings are designed according to bore riflings. They are not supposed to be the exact size such as .2200 or.3000. Riflings ID is always a bit smaller than the bullet diameter otherwise won't form the gas seal.
Our headspace gauge bushings are in exact marked size as this was made according to SAAMI headspace gauge standards. All our bushings do not have any ID chamfer and they were not sand blasted like some others. The clean sharp edge is designed for accurate...
Tip for choosing headspace gauges: measure the neck OD and shoulder OD. The best measuring point should be close to the middle line of the neck OD and Shoulder OD. The middle line of the shoulder taper. Therefore you should just choose which ever...
The LM393P is a dual differential input voltage comparator designed for operation from a single supply over a wide voltage range. The common-mode input voltage range includes ground and these devices have open collector outputs
Single supply or dual supplies, wide range of supply voltage: maximum rating: 2V to 36V
The LM393P contains two independent voltage comparators that are designed to operate from a single supply over a wide voltage range. Dual supplies can also operate as long as the voltage difference between the two supplies is within 2 V to 36 V and V CC...
The LM393P with two independent voltage comparators and are designed for use with a single supply over a wide voltage range. The quiescent current is independent of the supply voltage, and these outputs can be connected to other open collector outputs for...
Ultimate Accuracy Enhancement: Maximize your reloading accuracy with the AltitudeCraft headspace comparator kit, which includes 6 bushings to boost brass longevity, enhance accuracy, and ensure safety by precisely measuring brass variations before and...
Broad Caliber Compatibility: The AltitudeCraft headspace comparator reloading kit features a comparator body and 6 bottlenecks cases ranging from .17 Rem to belted magnums. An F.188" bushing also enables users to customize bushings for a broader range of...
Durable and Reliable Design: The reloading kit’s comparator body boasts the dual-screws design, enable seamless connection to your caliper blade, eliminating the need for a third hand to obtain accurate measurements. bushings are color-coded and feature...
Maximized Brass Lifespan: The headspace gauge kit is ingeniously designed to minimize brass work-hardening and stretching, significantly extending the lifespan of your brass casings.
What's Included in the Comparator Kit: The headspace comparator measuring tool includes a comparator body, 6 bushings for sizes A.330, B.350, C.375, D.400, E.420, and F.188, along with an allen wrench and a setscrew. Designed with the utmost safety in...
Hornady Comparator Kit – The Hornady Lock-N-Load Bullet Comparator is perfect for the reloader looking to measure seating depth of loaded ammunition quickly and precisely. Measures from the bullet ogive to the base of the loaded round, to eliminate...
Why Do You Need a Hornady Bullet Comparator – Measuring cartridge lengths across the bullet tips is not a reliable (or repeatable) method for measuring loaded rounds. It’s common for variations of up to .025” to exist from one round to the next
Reliable Rounds – Our Bullet Comparator measures rounds from the ogive to provide consistent, precise measurements. You can also use it to check uniformity of bullets from base to ogive
Easy Measuring – Our Bullet Comparator easily attaches to the blade of your caliper and uses interchangeable inserts (available in sizes from .17 caliber to .45 caliber) to measure from the bullet ogive
Kit Includes – Comparator body and 7 comparator inserts for the following diameter bullets: 224, 243, 257, 264, 277, 284 and 308. Allen Wrench also included. Other inserts sold separately. To position the comparator with the Hornady Lock-N-Load Overall...
1. Versatile Caliber Measurement Engineered for bullet reloading supplies and equipment, this Bullet and Headspace Gauge Comparator Kit delivers unmatched versatility across .17 to .45 calibers and .420 - .188 compatible headspaces. The reloading...
2. Set Upgrade - Adds an ANVIL BASE The anvil base attaches securely to the opposite blade of your caliper when used with a headspace comparator, making it easier to obtain both ogive and headspace measurements. It provides a large, stable surface area...
3. Innovative Design for Enhanced Accuracy: Features a tool-free dual-screw locking system for fast, secure caliper attachment—compatible with all calipers. Color-coded, hard-anodized inserts ensure easy identification and long-lasting precision...
4. Precision Manufacturing Crafted from premium 6061 aluminum, our Bullet and Headspace Gauge Comparator Kit is built to last. Precision-machined for exceptional accuracy, this tool ensures reliable measurements every time.
5. Ready to Use Out of the Box Covers a wide range of calibers, meeting the reloading needs of over 90% of commonly used ammunition. The dual-ended bullet comparator ensures uniform bullet seating and precisely measures from case head to shoulder...
Premium Craftsmanship for Multiple Calibers：Built with meticulous attention to detail, this headspace gauge comparator kit delivers exceptional fit and finish across a wide range of calibers. Each insert and bushing is precisely machined with smooth...
Accurate, Repeatable Measuring for Better Performance：This bullet comparator kit provides stable, repeatable readings by measuring from the ogive, helping users maintain consistent bullet seating depth and reliable case length evaluations. Whether...
Fast, Tool-Free Dual-Screw Locking System：Featuring an innovative dual-screw, tool-free locking structure, the body attaches securely to any caliper for quick setup. This user-friendly headspace comparator kit removes the hassle of juggling multiple...
Durable Build, Easy Handling, and Neat Organization：Crafted from high-quality aluminum, this gauge and comparator tool is solid, long-lasting, and comfortable to use. Every component is housed in a beautifully designed tin storage box—compact...
Complete Comparator Reloading Set Included，The comprehensive head space gauge set includes: Comparator body 14 bullet inserts for diameters: 172, 204, 224, 243, 257, 264, 277, 284, 308, 338, 358, 375, 416, 458 6 headspace bushings: A.330, B.350, C...
Hornady Comparator Kit – The Hornady Lock-N-Load Bullet Comparator is perfect for the reloader looking to measure seating depth of loaded ammunition quickly and precisely. Measures from the bullet ogive to the base of the loaded round, to eliminate...
Why Do You Need a Hornady Bullet Comparator – Measuring cartridge lengths across the bullet tips is not a reliable (or repeatable) method for measuring loaded rounds. It’s common for variations of up to .025” to exist from one round to the next
Reliable Rounds – Our Bullet Comparator measures rounds from the ogive to provide consistent, precise measurements. You can also use it to check uniformity of bullets from base to ogive
Easy Measuring – Our Bullet Comparator easily attaches to the blade of your caliper and uses interchangeable inserts (available in sizes from .17 caliber to .45 caliber) to measure from the bullet ogive
Kit Includes – Comparator body and 14 inserts for use with the following diameter bullets: 172, 204, 224, 243, 257, 264, 277, 284, 308, 338, 358, 375, 416 and 458. Allen Wrench also included. Other inserts sold separately. To position the comparator...
Last update on 2026-06-04 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Comparators
Ease of Use and Maintenance
User-friendliness is essential for efficient operation. Look for intuitive controls, clear displays, and straightforward calibration procedures. Maintenance requirements should also be a factor; simpler designs often require less upkeep. Ensure that spare parts and technical support are readily available for the model you select, especially for critical applications where downtime is unacceptable.
Frequently Asked Questions
What is the primary function of a comparator?
A comparator's primary function is to measure a workpiece by comparing it against a known standard or master. This comparison allows for precise determination of deviations in size, shape, or form.
What is the difference between optical and mechanical comparators?
Optical comparators use magnification to project an enlarged image of an object for detailed inspection. Mechanical comparators rely on physical contact and linkages to indicate differences from a standard.
How do I choose the right magnification for an optical comparator?
The required magnification depends on the size and detail of the parts you need to inspect. Smaller parts or those with fine features will require higher magnification levels for accurate measurement.
Are electronic comparators suitable for production environments?
Yes, electronic comparators are often ideal for production environments due to their speed, accuracy, and ability to integrate with data logging systems. They can streamline quality control processes.
What maintenance is typically required for a comparator?
Maintenance usually involves keeping the instrument clean, ensuring proper lubrication if applicable, and periodic calibration to maintain accuracy. Refer to the manufacturer's guidelines for specific care instructions.
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