Abstract: Apparatus for measuring the quantity of flowable particulate material passing through a conduit; the apparatus including a mounting portion, a flowable material contacting portion, a sensing portion, a circuitry portion and a quantity determining portion; the mounting portion including a support bracket, a transversely disposed bulkhead section affixed to the bracket adjacent the entry end of the apparatus; the flowable material contacting portion including a baffle extending from the bracket adjacent the entry end of the apparatus, the baffle having one end pivotally connected to the bracket, the baffle being pivotable away from the entry end of the apparatus; the sensing portion including mechanically actuatable voltage varying mechanism, the voltage varying mechanism being mounted on the bracket adjacent the pivotal connection of the baffle with the bracket, the voltage varying mechanism being operatively connected to the baffle; the circuitry portion including a converter converting voltage values into pe