 - Tektronix MDO4SEC^- Manufacturer: Tektronix
- Model: MDO4
 - Add enhanced instrument security to enable password-protected control of turning on/off all instrument ports and instrument firmware update functionality. One-time, permanent upgrade to any model enabled through ... $594 USDFarmingdale, NJ
 - Tektronix MDO4SA6^- Manufacturer: Tektronix
- Model: MDO4
 - Tektronix MDO4SA6 adds a Spectrum Analyzer with a frequency range from 9 kHz to 6 GHz to MDO4000C Series Oscillosopes. One-time, permanent upgrade to any model enabled through single-use application module hardwa... $8,306 USDFarmingdale, NJ

