The Command Mobile Module functions the same as the Digital Mobile Module, with the additional ability to send a command from a base unit to initiate a gage reading. The Mobile Module is used to capture measurements from most digital and RS-232 handheld gages such as calipers, micrometers, digital indicators, etc. Features Include: Securely attaches to all handheld gages. LEDs positioned to provide highly visible user feedback. User replaceable cable gage. Range up to 133 feet. Typical battery life in excess of 2 years. Field upgradeable firmware. Automatically turns itself off after each reading. No power switch required. Read button is rated for 1 million cycles. Gage cable in lengths up to 72". **GAGE INTERFACE CABLE IS REQUIRED