In-Depth Guide to the Edge-On-Up Sharpness Tester: Revolutionizing Blade Sharpness Measurement

How Sharp Is My Knife? The Tool That Gives a Precise Answer

When it comes to sharpening knives, tools, or cutting edges, the question every sharpener asks is: how sharp is it, really? Traditional methods—like slicing paper or shaving arm hair—give you a general sense, but they’re subjective.

The Edge-On-Up Sharpness Tester eliminates guesswork with a standardized measurement using the BESS scale. Whether you're a professional sharpener or a home user, this tool gives you accurate, repeatable results in grams of force.

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What is the Edge-On-Up Sharpness Tester?

The Edge-On-Up Tester is a precision device that measures the force (in grams) required to cut through a certified test medium. The lower the number, the sharper the edge. This force is displayed on the Brubacher Edge Sharpness Scale (BESS)—a universal system used by knife sharpeners, manufacturers, and enthusiasts worldwide.

The tester is available in three models as part of the PT50 Series:

• PT50A: Industrial

• PT50B: Professional

• PT50C: Home

Each model uses the same certified test media and testing method to ensure consistent results across all platforms.

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Understanding the BESS Scale (Brubacher Edge Sharpness Scale)

Created by Mike Brubacher in 2012, the BESS scale offers a standardized method for evaluating how sharp an edge really is. It replaces vague descriptors like "razor sharp" or "somewhat dull" with hard numbers.

How the BESS Scale Works

• A certified test medium (thin synthetic filament) is placed in the fixture.

• The blade is gently pressed down until it cuts through.

• The force required is measured and displayed in grams.

BESS Score Reference Table

BESS Score	Sharpness Level	Example
0–50	Razor sharp	Fresh double-edge razor blade
50–150	Extremely sharp	High-end kitchen or hunting knife
150–300	Very sharp	General kitchen knives
300–500	Moderately sharp	Worn utility knives
500+	Dull – needs sharpening	Factory edge or heavily used knife

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BESS A vs. BESS C Scale

The early analog testers used the BESS A-scale, while current digital models use the BESS C-scale, which is now the standard.

Conversion:

• A to C: Add 50 grams

• C to A: Subtract 50 grams (minimum 0)

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Edge-On-Up PT50 Series: Choosing the Right Model

PT50A – Industrial Model

• Best for: Knife shops, manufacturers, labs

• Resolution: 1 gram

• Features: 25 readings/sec, 3000g load limit

• Includes: Both test fixtures

• Warranty: 3 years

PT50B – Professional Model

• Best for: Sharpeners, knife collectors, woodworkers

• Resolution: 5 grams

• Includes: Aluminum fixture

• Warranty: 1 year

PT50C – Home Model

• Best for: Kitchen and hobby sharpening

• Resolution: 25 grams

• Includes: Disposable Clip System

• Power: 2 AAA batteries

• Compact and easy to store

Explore our sharpening gear to match your tester:
👉 View Sharpening Systems at Axeman.ca

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How to Use the Edge-On-Up Tester

1. Setup: Place the tester on a flat surface and install the test medium.

2. Position the Blade: Align it with the filament in the test fixture.

3. Test: Press gently until the blade cuts through. The peak force is displayed in grams.

4. Record: For best accuracy, test the tip, middle, and heel of the blade and calculate an average.

5. Replace Media: Clip or slide in new certified test wires after every few tests.

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Why Use a Sharpness Tester?

• ✅ Objective Data: Replace vague testing methods with measurable sharpness scores

• ✅ Track Progress: Monitor how sharpening methods affect edge quality

• ✅ Quality Control: Useful for resale or service guarantees

• ✅ Repeatability: Same results whether in BC or Berlin

• ✅ Tool Versatility: Works on knives, chisels, scissors, even plane blades

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Real-World Uses for the Edge-On-Up Tester

• 🔪 Professional Sharpeners: Deliver consistent results and prove sharpness to clients

• 🍽 Chefs & Home Cooks: Know when your kitchen knives are at their best

• 🪓 Woodworkers: Ensure chisels and plane irons are razor-sharp

• 🏭 Manufacturers: Perform QA testing on production blades

• 🏆 Sharpening Competitions: Used worldwide in competitive sharpening events

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Limitations to Consider

• Single-point readings only (test multiple points for best results)

• Serrated blades are difficult to measure accurately

• Initial learning curve for proper technique

• Ongoing cost for replacement test media

• Higher-end models may be cost-prohibitive for casual users

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Frequently Asked Questions

Q: How do I know if my knife is sharp enough?
A: A score under 300 BESS is considered very sharp and suitable for most uses.

Q: Can I test scissors or chisels?
A: Yes! The PT50A and B models are versatile enough to test a range of tool types.

Q: How often do I need to calibrate it?
A: Every 6 months or after approximately 500 tests.

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Axeman.ca — Sharpen Smarter

At Axeman.ca, we believe sharp tools are safe tools. If you’re ready to level up your sharpening skills and bring data into your sharpening process, the Edge-On-Up Sharpness Tester is a powerful ally. Pair it with a Tormek sharpening system or premium axe file to get consistent results you can measure—and trust.

Have questions about edge tools or sharpening accessories?
📩 Contact us at Axeman.ca