Abstract: Disclosed is a meter for mounting in flow-sensing relationship to a pipeline conductor or electrical line having a commodity such as water, natural gas or electricity flowing through it. In one embodiment, the meter has a transceiver inductively-coupled to a remote signal-radiating device such as a repeater antenna for sending an encoded signal to a remote receiver. Another embodiment of the meter includes a rechargeable device such as a nickel-cadmium battery for storing meter-powering electricity and a charging generator coupled to such device. The generator has a turbine driven "bootstrap fashion" by the commodity flowing through the conductor. Preferably, solid state digital technology is used for minimizing power consumption during meter operation.

Abstract: A fluid level detector comprises a thermoresistive probe and a controlling circuit. The probe replaces the conventional dip stick on internal combustion engines and other machinery having an oil sump and a dip stick tube. The probe comprises an elongated wand of insulative material to which is threaded a length of thermoresistive wire, the resistance of which varies with the amount of immersion thereof into the oil. The circuitry operates various light emitting diodes for alerting operating personnel of the oil level. The probe wire is connected to the circuitry via conductive strips bonded to the wand and conductive elements in contact with the strips and leading to the circuit. An insulative sheath surrounds the wand and strips. A rubber grommet attached to the upper end of the probe seals the machine dip stick tube.