Profile: Geomem Ltd. specializes in manufacturing high quality, time and operator tested borehole survey instruments. We also offer services like borehole data gathering and analysis software, drill instrumentation and services to exploration, drilling, quarrying, mining, engineering, and construction industries. For borehole survey, we use a calibrated optical encoder, wherein the DDE displays depth and rate per meter. Our external wireline units are no longer necessary, as the DDE operates on the drill rings wireline, reducing the capital costs of downhole surveying. The unit is quickly and easily attached to the wireline using a simple slot design.