Thermocouples-digiqual systems , chennai, india. digiqual systems - exporter, manufacturer & supplier of digital temperature controller, micro processor based temperature pid controllers, blind controllers, pressure controllers, volt controllers, digital timers, event counters, humidity controllers, water level controllers, rpm indicators, ph indicator, thermocouples,thermometers, industrial thermocouples rtds sensors , ntc thermistors, thyristor drives, all types of industrial heaters