Abstract: A level sensing apparatus for attachment to a sounding tube in order to measure levels of contents in a tank and for determining the purity of contents in a tank. This level sensing apparatus includes a housing for enclosing the various components of the level sensing apparatus. The level sensing apparatus of the present invention also includes a sounding tube adapter operatively connected to the housing and is further adapted for attachment to a sounding tube. Additionally, the level sensing apparatus includes a lock operatively connected to the sounding tube adapter and capable of receiving the housing. Finally, the level sensing apparatus includes a swivel connector operatively connected to the housing, whereby the housing is capable of moving cooperatively with the swivel connector.