Abstract: A low profile battery tester uses tapered apertures to located batteries in a thin tablet shaped body for testing. In one embodiment for conventional dry cells, the taper is in openings through the body, and in another embodiment for button cells the aperture does not extend through the body and the taper is in the plane of the body. A display of battery condition is provided by an array of light emitting diodes mostly driven by comparators, voltage references for the comparators being provided by a circuit including one of the light emitting diodes.

Abstract: A hazard warning device for use in place of a conventional flare has a lamp assembly using a long shelf life battery to over-run light emitting diodes under control of a low duty cycle low frequency oscillator. The lamp assembly is built into a lens at one end of a baton-like device, the remainder of which is a stem provided with a strut assembly similar to an umbrella frame which can be deployed between a folded condition with the struts lying against the stem and a deployed condition in which it forms a tripod support for the device.

Abstract: Apparatus for the continuous monitoring of levels of ionizing radiation in premises for human occupation is provided, including an enclosure for location in premises to be monitored, an ionizing radiation transducer within the enclosure and producing counts in response to radiation incidents, a power supply continuously providing an an operating potential to said radiation transducer, a time base defining monitoring intervals of at least about 5 seconds, a counter for accumulating counts during successive monitoring intervals, and alarm means responsive to the accumulated count during a monitoring interval exceeding a predetermined threshold representing a level of ionizing radiation which if continued over an extended period would expose a human being to a cumulative dosage exceeding a level deemed acceptable.