Profile: Stock Electronics Ltd. deals with motor speed controllers. We are an ISO 9002 certified company. We provide a wide range of manual and automatic controllers for 1 & 3 phase applications. Our temperature & pressure sensed controls suitable for use with all common refrigerants. We focus on AC motor speed control of fans & pumps, principally within the H.E.V.A.C industry. We have developed a microprocessor controller which ensures an appropriate negative differential pressure exists within the boiler flue with respect to atmospheric pressure in occupied areas.