Rayleigh Instruments Limited are manufacturers and stockists of an extensive range of energy monitoring and renewable energy products; including current transformers, kilowatt hour (kWh) meters, multifunction power monitors, measuring transducers, data loggers, PV inverters and batteries, communication interfaces and software. We also stock analogue and digital square din switchboard instruments, safety, temperature, and pressure relays and timing products.Our design and manufacturing facility produce a number of products for railway rolling stock including door systems and buttons, audible devices, illuminated displays, speed controllers and thermostats.Established in 1964 we have become one of the leading manufacturers and suppliers of process control instrumentation equipment in the UK.