Abstract: A finger guide for use in measuring, marking, scribing, cutting and similar operations common to the field of construction. The device assists in performing these operations on an object such as a board or piece of drywall. The finger guide has a top guide which is laid on the top surface of an object, and a perpendicular edge guide which abuts an edge of the object. The edge guide includes an index finger hole which allows the user to slip the device on his or her index finger and “wear” it like a ring. The top guide opens into a tape trough positioned to receive and hold a length of metal tape from a conventional tape measure. The top guide also includes reference marks used for measuring. Other features allow the device to be used as a saw guide in conjunction with a conventional circular saw.