Introducing the IV-21
The pen perfected
Writing. Timekeeping.
Data Storage. Security. Flashlight. All in one.
Swiss made Cold War tested


Powered by Cold War era Soviet IV-21 vacuum fluorescent display tubes, each Swiss made Gelfman IV-21 pen uses the same tube technology that powered MiG aircraft radar. "Gelfman: where the past meets the future." ‘Gelfman IV-21 pen’
’Where the past meets the future.’

Due to limited IV-21 VFD supplies, only 6,000

IV-21 pens will ever be produced

Gelfman IV-21 pen

A pen for everyone

Kickstarter edition
$ 399
Avaiable for pre-order only
and weight
18 mm
(0.71 inch)
Weight: 130 g (4.58 oz)
160 mm
(6.30 inch)
(8 digits)

68 mm
(2.68 inch)
Power and battery

Built-in Li-ion battery

Time of continuous operation of lamps: Up to 2 hours When fully charged

While working in standard mode use: Up to 48 hours When fully charged

Charging time: fast charge in about 2 hours (80% capacity), full charge in about 4 hours.


Light color: Green

Rated brightness of the display:
Single digits:            300 cd/m2
Service categories: 175 cd/m2

Heater voltage: 2.4 V

Filament current: 35 ± 5 mA

Grid voltage pulse: 27 V

Weight: Not more than 13 g


Accelerometer to move the time and use the other functions clock

Size and weight

Thickness: 18 mm (0.71 inch)

Length: 160 mm (6.30 inch)

Weight: 130 g (4.58 oz)

Display: (8 digits) 68 mm (2.68 inch)


Program for Windows and MacOS, which allows convenient control the functions of G-Pen. Without the use of the program, pen is defined as a standard USB flash drive


Operating Temperature: from -25 to 35 °C

Storage temperature: from –45 to 45 °C

Relative humidity: from 5 to 95%

The height of the operation has been tested:
Up to 3000 m

Delivery includes

Gelfman IV-21 pen

Software for Windows / Mac

Getting Started Guide

Downloadable content for your best experience with IV-21
Press here to connect your Gelfman IV-21 pen.

Pre-Order $399

Retail price: $599
Tell a friend
about IV-21 pen

Available April 2016
Order ships in 3-5 business days

Place order