The TC-21/22 by Alti-2 is a portable, positive pressure Test Chamber similar in appearance to TC-10. However, TC-21/22 is designed to test up to 10 military Altimaster altimeters over a complete range of altitudes, regardless of ambient altitude. It's perfect for units whose facilities are above 1000 FT MSL or that deploy to high elevation areas such as Afghanistan.

By using both vacuum and positive pressure sources, the TC-21/22 can test from -1000 ft to 30,000 ft MSL.