The STU-540 is Wacom’s most advanced and robust signature pad, featuring a 5″ high-resolution color screen with a hardened durable cover glass. Its broad range of connectivity options – including multiple choices for virtualized desktop environments, top-level encryption and user convenience give it the flexibility to meet the growing demands of organizations implementing handwritten electronic signature.

STU-540 features and benefits

  • Patented cordless, battery-free pen with 1024 levels of pressure sensitivity to accurately capture the unique signature profile, including biometric data.
  • Hardened cover glass with anti-glare treatment provides enhanced viewing and a signing surface with a natural pen-on-paper feel.
  • State-of-the-art AES 256/ RSA2048 encryption to perform secure transactions.
  • Native support for Citrix v7.6.3 and newer in standard USB mode.
  • Virtual COM Port (VCP) mode available for compatibility with Citrix v6.5 and other virtualized desktop environments.
  • “Slideshow” mode can run advertising and promotional messages directly from the pad itself.
  • Customizable key pad enables input utilizing user-defined UI.
  • WILL (Wacom Ink Layer Language) rendering to show the best and most authentic representation of your handwritten electronic signature.
  • UID (Unique hardware ID) can be used to confirm the exact unit used to capture a particular signature.
  • Serial connectivity available as an option with separate accessory kit.
  • STU SDK (Software Development Kit) and Signature SDK are available for developers who wish to integrate support for Wacom signature pads into their applications.


STU-540 Images
STU-540 Factsheet

Technical specifications

General specifications

Communication interface USB 2.0/RS-232
Overall dimensions 163 x 157 x 10 mm (6.41 x 6.18 x 0.39 inch)
Power supply USB bus powered
Display type Amorphous TFT LCD
Screen size 5'' (108 x 65 mm)
Native resolution 800 x 480 pixels
Reading technology Electromagnetic Resonance (EMR)
Pen pressure levels 1024 (non-interpolated)
Pen report rate 200 points per second (non-interpolated)
Coordinate resolution 2,540 lpi / 0.01 mm/pt(non-interpolated)
Coordinate accuracy ± 0.5mm (center)
Security lock slot Yes
Battery-free pen Yes
Cordless pen Yes