The IFR 6000 from Aeroflex is a compact, lightweight, and weatherproof unit designed for testing transponder modes A/C/S, TCAS I and II, and DME. It features a user-friendly interface with all common parameters displayed on the screen. One main screen is provided for each test mode. Features include a detachable antenna, large display, weight of 8 lb, battery duration of 6 h plus, FAR part 43 appendix F compliance, and European Elementary and Enhanced Surveillance. Dedicated mode keys for XPDR, DME, and TCAS allow quick selection of operational mode. DME mode is provided with dedicated keys for frequency/channel selection and RF level control. For frequently varied parameters in DME and TCAS modes, such as Range and Rate, dedicated keys are provided.