Topcon 312890112 Sensor Holder 6 for LS-80 Laser Receiver Overview for Topcon 312890112 Sensor Holder 6 for LS-80 Laser Receiver The Sensor Holder 6 for Topcon LS-80 Laser Receiver is designed to hold the Topcon LS-80 series laser receivers . This holder can be mounted to a tripod or can be attached to a leveling staff for stable leveling. It features a static thread that keeps the side of the clamp from being in the way. This Topcon sensor holder is made of durable plastic that weighs less than pound for easy use.