Profile: Check-It Electronics Corp. manufactures temperature and humidity instruments. Our products include digital tire pyrometers, digital psychrometers, digital welding pyrometers, digital relative humidity meters and digital flame safety control tester sets. The Check-It 0628 superheat humidity set charges air conditioning systems. It has features such as moisture proof circuitry, large 0.5 inch LCD display, open probe indication and low battery indication. The Check-It 0622 digital psychrometer is designed for all areas where accurate air, relative humidity and dew point temperatures must be taken. It has 0.5" LCD display, low battery indication and a stainless steel probe.