TSI 4040 LCD Gas Flow Meter Calibrated by 4 Gases is designed with an innovative platinum film sensor enabling high accuracy over a broad range in addition to an impressive turn-down ratio that exceeds 1000:1. The TSI 4040 features a rapid 4 millisecond flow response time, integrated temperature and pressure compensation, flow rate displayed via analog or digital, minimal pressure drop, RS232 interface, adjustable update and sampling rate, and more.