Profile: Rayleigh Instruments Limited is a manufacturer and supplier of process control instrumentation equipment. We stock an extensive range of products including analogue & digital instrumentation, electrical transducers, current transformers, safety relays, measuring relays, timers, industrial switching relays and earth leakage relays. We also design & manufacture a number of products for railway rolling stock including door systems & buttons, audible devices, illuminated displays, speed controllers and thermostats.