Abstract: An off-hook telephone clearing system for a telephone line having at least two telephones connected thereto, comprising a howler tone detector connected to each telephone, and a telephone disconnect device having an input responsive to the howler tone detector for disconnecting a telephone being in off-hook condition from the telephone line. The clearing system may include a latching relay in the disconnect device. The latching relay may be mechanically coupled to the telephone hookswitch for delatching upon hang-up of the receiver.

Abstract: A salt sensor is disclosed which is portable and easily handled by a person at a restaurant or in his home for determining the sodium content of the food or beverage he is about to consume. The salt sensor includes a uniquely designed contact top which is electronically connected to a circuit which generates an AC signal. The strength of the signal transmitted across the contact tips is directly proportional to the conductivity of the food or beverage being tested and is, accordingly, registered on a display panel located on the body of the salt sensor.