Attributes

Brand	-
Category	Stationery, Educational Electronics & Office Supplies / Flat Brushes
Origin	-
Brand	General Agent USA
Product Type	Dyne Test Pens
Available Sizes	30, 32, 34, 36, 38 dyne/cm
Design Style	Schumann Type
Reusability	Reusable with proper cap sealing
Application Surface	Plastics, films, and coated materials
Certification Standard	ISO Compliant Testing
Ink Color	High-contrast blue
Packaging	Individual protective sleeve
Country of Origin	USA

6 reviews

Anonymous

Mar 31, 2026

Rating: 5/5

Perfect for adhesion testing

We use these to verify corona treatment levels before applying adhesives. The distinction between the different dyne levels is very clear, making it easy to determine if the surface is ready for bonding.

Anonymous

Mar 15, 2026

Rating: 5/5

Essential for our quality control lab

These dyne pens are incredibly consistent. We use them daily to test surface tension on various polymer films, and the results match our electronic tensiometers perfectly. The Schumann design makes them easy to handle.

Anonymous

Mar 14, 2026

Rating: 4/5

Solid performance

Great product overall. The reusable nature is a nice touch for cost savings. Just remember to recap immediately after use to prevent the ink from drying out, as with any marker of this type.

Anonymous

Mar 08, 2026

Rating: 5/5

Reliable ISO standard tools

As a printing technician, accurate surface energy testing is critical. These General Agent USA pens provide reliable readings every time. They are much more durable than disposable alternatives we have tried in the past.

Anonymous

Mar 04, 2026

Rating: 5/5

Industry standard quality

I have been using A.Shine dyne pens for years, and this batch maintains the high quality I expect. The 36 and 38 sizes are particularly useful for our newer high-energy substrates.

Anonymous

Mar 01, 2026

Rating: 4/5

Good value, fast shipping

Ordered a set ranging from 30 to 38 dyne. They arrived quickly and were well-packaged. The ink flow is smooth. I deducted one star only because the cap on the 34 pen was slightly tight, but it works fine now.

5 FAQ

Q: How long does the ink last once the bottle is opened?

A: With proper storage and immediate recapping after each use, the ink typically remains effective for 6 to 12 months. Avoid exposing the tip to air for extended periods.

Q: Do these come with a certificate of calibration?

A: Yes, each batch is manufactured under ISO standards. A general certificate of compliance is available upon request for bulk orders, confirming the dyne levels meet specified tolerances.

Q: Can I refill these pens when they run dry?

A: No, these Schumann-type pens are designed as sealed units to maintain ink purity and calibration accuracy. Once the ink is depleted, the entire pen should be replaced.

Q: What is the difference between the 30 and 38 dyne pens?

A: The number indicates the surface tension level in dynes per centimeter that the ink is calibrated to wet. A 38 dyne pen will only spread on surfaces with energy equal to or higher than 38, while a 30 dyne pen will spread on lower energy surfaces as well.

Q: Are these pens suitable for testing metal surfaces?

A: These dyne pens are specifically formulated for non-porous plastics, films, and coated materials. While they can technically be used on clean metals, they are optimized for polymer surface energy testing.

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