SMPTE-304TS is compatible with all SMPTE 304 standard connectors and tests both electrical and optical circuits while the intuitive display graphically depicts which contact is defective or pinned out incorrectly, ultimately saving you time and money. The tester unit includes one metering unit and one optical source unit. There is an OLED backlit display so you can easily see in direct sunlight or at night. Graphically depicts which contact is defective or pinned out incorrectly. Rechargeable battery lasts up to 40hrs, 5V outlet power charger and operating instructions included.