The BenchMark Wireline Backup Depth and Speed Display System is designed to be an independent depth and line speed measurement indicator. The display panel is designed to be mounted inside the wireline unit.

The system consists of three items, the display panel, the magnetic pickup, and the interconnecting cable. A magnetic pickup can be installed on any of the BenchMark measuring heads.

A magnetic pickup can be mounted to the speedometer drive output from any measuring head.

An optional right-angle drive with two outputs can also be provided to allow a Veedor Root counter to function simultaneously.

The unit is powered by three internal rechargeable batteries. It can be connected to an external AC or DC power source to keep the batteries charged.

The unit is designed to operate without intervention from the user. When external power fails, the depth display is maintained by the batteries. When the magnetic pickup is inactive for the time set by the shutdown timer the depth is stored and the unit switches itself off.

The enable switch must be pressed in conjunction with the zero or depth adjust switch to prevent accidental loss or corruption of the depth display value.

The panel has a built-in data recorder that stores depth and line speed data in text format. The panel also has a built-in internal clock that runs continuously whether powered up or not. This clock is used to provide a time and date stamp for every data record.