• Signature Pad Zeta

    Description of the signature pad "Zeta" by signotec with a monochrome LCD screen.

  • Short Summary :

  • Signature Pad Zeta

    is an unbeatable combination - from the already proven signature pads Sigma and Gamma. During the development process, explicit attention was paid to perfectly combining the advantages and technologies of both models: The German Design Award winning design of the signature pad Gamma and its robustness of the ER technology meet the low-cost monochrome display of the signature pad Sigma.


Signature Pad

Zeta is the latest model in the signotec family and has an approx. 4.5-inch (11.4 cm) monochrome display and the popular, durable ER technology. The sensor reacts exclusively to the special battery-less pen and not only records movements with 1,024 pressure levels and up to 500 Hz sampling rate, but also detects the movements of the pen in the air.

This enables the signature to be digitised in great detail and thus has a correspondingly high evidential value in court proceedings. Due to the device design, a very long lifespan of up to 30 million signatures can also be expected from this pad.The signature Pad Zeta thus perfectly closes the gap between the low-cost signature Pad Sigma and the signature Pad Gamma as the most cost-effective device with ER technology so far.

Like all models of the signature pads, the signature Pad Zeta was developed entirely in-house "Made in Germany ", combining decades of experience and competence. Furthermore, all signature pads have unique security features, such as the signature and RSA encryption in the pad's secure memory. Due to the flat surface without edges between sensor and housing, all pads offer an extremely comfortable signing experience.

Highlights - Signature Pad Zeta

Signature Pad Zeta

  • 4.5" (11.4 cm) monochrome display with  320 x 200 pixel resolution
  • Modern ERT sensor (reacts only to the pen)
  • Life expectancy of approx. 30 million signatures
  • Batteryless special pen with exchangeable pen tip
  • Acquisition of 1,024 pressure stages
  • Transmission rate of the 4D signature data at 500 Hz
  • Only one USB cable for connection
  • Patented security for the conclusive signature of PDF documents
  • RSA encryption of the font characteristics in the pad
  • Freely configurable standby image
  • Individual design options and OEM production (colors and logo printing)


Type 11.4 cm (4,5") Mono LCD, optional with LED-backlight
Colours Monochrome
Resolution 320 x 200 pixels
Scroll-Function No


Type ERT (Electromagnetic-Resonance-Technology)
Pen batteryless special pen with changeable pen tip
Surface particularly resistant, hardened special glass
Life expectancy approx. 30 Million Signatures
Pressure Stages 1.024
Sample Rate 500 Hz, 4D Samples (x, y, z, t)
Active Signing Area 96 x 60 mm
Resolution 9.598 x 5.998 Pixel ≙ 2.487 x 2.499 ppi


Encryption AES- and RSA-Encryption
Secure Mode Real-time display of the signature without usable biometrics
PDF-Signature RSA signature creation device inside the pad
Hash-Algorithms SHA-256 und SHA-512

More information can be found below in the tab "Security features".


Connection USB (approx. 2.7 meters cable length)
Power Supply USB
Network (TCP/IP) Yes, with optional signotec USB-Ethernet-Adaptor
Terminal Server / Citrix Yes, optional with hardware FTDI chip or signotec vCOM driver
Citrix Virtual Channel Yes, optional with signotec Virtual Channel driver


Dimensions (W x D x H) 145 x 177 x 12 mm
Weight approx. 230 g
Status LED 2-colour status LED
Slideshow Yes, you can configure one standby image inside the pad.
Customization Change of housing color and logo print (on request)
Warranty 2 years

The signature pads have the highest security mechanisms available. This allows a complete chain of evidence in dispute. Depending on the integration, different techniques are used:

  • PDF documents can be signed inside the pad and not in the insecure environment of the PC.
  • The biometric data of the signature can be RSA-encrypted inside the pad using a public key.
  • RSA-signature of the displayed content and signature.
  • Upon delivery, each pad has a separate and unique RSA certificate for signing.
  • Storing of custom RSA-certificates inside the pad.
  • The pad can generate a RSA certificate.
  • Supported schemes are RSA PKCS # 1 v1.5 (with or without the hash OID), PKCS # 1 v2.1
  • Certificates can be certified by a Root Authority
  • Supported hash algorithms are SHA-1, SHA-256 and SHA-512.

Astral strives to bring the best digital signature experience to our customers around the world through its innovative hardware and software.

Astral welcomes your feedback on its products.

Made In Germany
Made In Germany
  • Self-sufficient slide show with up to 10 graphics
  • Including free of charge software packages incl. SDK for several programming languages
  • Unique RSA-signature creation device and RSA-encryption methods inside the pad
  • "Content Signing" allows to directly sign the content displayed on the LCD, to assure to sign the correct document
  • Secure mode for real time display
  • Several options for secure certificate and key management inside the pad
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