Abstract: A device to record the location, expressed as Cartesian coordinates, of sensor readings, to be attached to a sensor, such as a radiation sensor. The device comprises a plurality of transmitters, a plurality of receivers, processing means, display, and storage means. The processing means calculates the Cartesian coordinates and displays and records the coordinates of each sensor reading.

Abstract: A device to count strikes, to be attached to one object that strikes another, such as a boxing glove, or to an object that is being stricken, such as a punching bag. The device comprises a structure for mounting the device to a striking object or an object being stricken. The device further comprises an inertia sensitive switch, a circuit connected to the inertia sensitive switch, a reset switch connected to the circuit, and a display which is controlled by the circuit. The inertia sensitive switch closes in response to a predetermined amount of inertial force created by movement indicating a strike. The circuit generates a signal to the display indicative of this count whereby the number of strikes is known.