Technology Experiment Satellite (TES) was launched by the PSLV-C3 rocket from the Satish Dhawan Space Centre at Sriharikota on the southeast coast of India at 04:53 UT on 22 October 2001.

The technologies demonstrated in TES are attitude and orbit control system, high torque reaction wheels, new reaction control system with optimised thrusters and a single propellant tank, light weight spacecraft structure, solid state recorder, X-band phased array antenna, improved satellite positioning system, miniaturised TTC and power system and, two-mirror-on-axis camera optics.

The launch of TES made India the second country in the world after the United States that can commercially offer images with one metre resolution.

[2] It is used for remote sensing of civilian areas, mapping industry and geographical information services.

TES, helped the US Army with high-resolution images during the 11 September 2001 counter-terrorism offensive against the Taliban.