Markal 82441 UltraScan is a next‑generation fluorescent polymer lumber grading marker engineered for maximum visibility and machine readability. Designed to deliver superior performance on wet or green lumber—including surfaces treated with fungicide—its vivid Green 62 shade ensures seamless recognition by automated grade‑mark readers like Lucidyne ColorScan® and Newnes‑McGehee systems. Available as an individual marker, this industrial-grade polymer crayon offers extended durability and consistency for mill grading and inspection tasks.


  • Advanced Polymer Formula delivers up to twice the writing life of conventional fluorescent crayons—ideal for high-volume marking.

  • Superior Fluorescent Visibility ensures the clearest color separation and character recognition across grade‑mark readers.

  • Consistent One-Hardness Design across temperature ranges, eliminating multi-hardness inventory complexity.

  • Excellent Wet/Green Lumber Performance, even on fungicide-coated surfaces.

  • Optimized Shape & Size: 11/16″ (≈17 mm) round tip × 4 ⅝″ (≈118 mm) length—designed for uniform grade-marking.

  • Works with Automated Readers—each batch tested to meet specifications of Lucidyne and Newnes-McGehee systems.
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  • Made in the USA, ensuring consistent industrial quality and reliability.
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