Pune Techtrol Pvt Ltd. Manufactures Vibrating Fork Level Switch. Pune Techtrol Pvt Ltd. Is an ISO 9001:2000 certified Company. The Vibrating Fork Level Switch is a point level switch based on piezo driven vibrating fork technology. This switch is designed to detect all kinds of free flowing powders, grains and granular solids in Bins, Silos or Hoppers. This is suitable for detection of liquids in tanks.