Abstract: The present invention relates to a sensor apparatus configured to detect the presence of a gas, such as a tracer gas and a leak detection apparatus configured to detect the present of a tracer gas and indicate the location of a leak. The sensor apparatus includes multiple sensors, each of which is a metal halide sensor. The leak detection apparatus may further be configured to quantify the leak rate at the leak location.

Abstract: The gun safety assembly includes a hand gun, a reel bearing an elongated cord connected thereto and a spring connected to the reel for biasing the cord toward and around the reel. The device also includes a ring on the gun butt and a snap ring on the free end of the cord releasably connecting the gun and cord, and a loop on the reel releasably connecting it to a gun belt. The reel is in the form of an outer casing with a cord opening therein, a cord spool disposed for rotation in the casing on a spindle, one end of the cord being secured to the spool, and a spiral spring in the casing with one end thereof connected to the casing or spindle and the other to the spool so that as the spool rotates in a selected direction to pay out the cord, the spring biases the cord toward and around the spool. The spring, casing, spool, spindle, cord, ring and snap ring preferably are of metal.