Super User TopTrack 820 Mass Flow Meter Econmical 800 Series Mass Flow Meter from Sierra Instruments Sierra Instrument's The TopTrak® 800 series provides an economical OEM gas mass flow meter in your choice of nylon, aluminum or stainless steel. Direct mass flow rate measurement with the nylon version at prices below that of a typical rotameter Large tiltable display that can be mounted on the device or on a remote panel Large cleanable sensor tube for use with dirty gases TopTrak 820 features Proven gas flow measurement with affordable OEM pricing For fast delivery, buy online, next-day shipment Save money with volume discounts Read results easily with large tiltable display Easy drop-in replacement with compact size Available in economical nylon, stainless steel and aluminum TopTrak 820 benefits Ideal for OEM and general industry applications Choice of nylon, aluminum or stainless-steel construction Large, tiltable display readout Compact size makes drop-in replacement easy Mass flow rates up to 500 slpm (nlpm) for stainless-steel version Stainless-steel version has large cleanable sensor tube for use with dirty gases TopTrak 820 Document Downloads DOWNLOAD PDF for the TopTrak 820 Series Specificatin Sheet from Sierra Instruments DOWNLOAD USER MANUAL