TSI 4043 Mass Flowmeter for Gases with LCD uses an advanced proprietary platinum film sensor design allowing for high accuracy over a wide range and an incredible turn-down ratio that exceeds 1000:1. TSI 4043 is suitable for a wide variety of applications, is designed with a 4 millisecond response time, and has built-in temperature and pressure compensation. USA MADE. Includes certificate of NIST calibration.