Patent ID: 7385390

Claim:
A construction device for establishing a reference point on a structure, the construction device comprising: a housing with an indicator disposed thereon; a signal sensing device connectable to the housing, the indicator being in electronic communication with the signal sensing device for indicating a drilling point on a first side of a structure; and an emitter being configured for placement on a second side of the structure for emitting a signal therefrom, the signal sensing device being configured to sense the signal emitted from the emitter and being further configured to communicate the sensed signal to the indicator to indicate alignment of the signal sensing device and the emitter for drilling into the first side of the structure in a direction of the emitter as the emitter emits the signal from the second side of the structure, wherein the indicator includes at least four light emitting diode bars spaced equally apart about the housing, each of the four light emitting diode bars having at least two light emitting diode bays, at least one of the first light emitting diode bays being configured to emit light when the signal sensing device senses the emitted signal, the second light emitting diode bays being configured to emit light when the signal sensing device and the emitter are aligned.