microprocessor based process controllers, pH meters, pH controllers, conductivity meters, conductivity controllers, current meters, strain meters, weight meters, thermocouple meters, RTD meters, thermistor meters, thermocouple controllers, RTD controllers, thermistor controllers, controllers, process meters, rate indicators, differential temperature meters, digital meters, digital panel meters, microprocessor based indicators, indicators, temperature indicators, process indicators, strain indicators, pH indicators, conductivity indicators, digital counters, digital temperature controllers, panel meters, high performance process indicators, smart transmitters, temperature controllers, temperature meters, voltage meters, strain meters, pressure meters, scale meters, totalizers, batch controllers, rate meters, counter/timers, process/timers, signal conditioners, and casings for the foregoing instruments; all of the foregoing are used for measuring, controlling, and/or regulating temperature, humidity, pressure, strain, force, flow, level, pH, load, vibration, electrical resistance, air velocity, amperage, frequency, voltage, ion concentration, conductivity, motion and other environmental parameters