CAL Controls Ltd is a British supplier of controllers, profilers and transmitters. Founded in 1963 in Hertfordshire, CAL Controls has since joined PMA, Partlow and West to form West Control Solutions. CAL's product development philosophy resulted in worldwide standards in technology such as the first 1/16 DIN (48x48mm) analog and digital controllers, followed by the first 1/32 DIN (24x48mm) digital controller.

ISS provides the full range of controllers, profilers and transmitters developed by CAL.