The Smart-Trak 50 from Sierra Instruments, Monterey, CA, delivers ±1.5% F.S. accuracy, ±0.25% F.S. repeatability, a 300 ms response time, and a 0–50 slpm range. The flow controller, using the same core technology as the Smart-Trak 100, comes with 316L SS wetted materials, field zero and span adjust, analog outputs, RS-232 and RS-485 outputs, and an optional large local display. The modular controller can be calibrated onsite.