Sage Metering's Prism Flowmeter
Prism is a battery-operated thermal mass flowmeter with data-logging capability. It operates for up to 10 hours on a built-in rechargeable lithium-ion battery and can measure and log gas flows through existing ports in pipes 1 in. and larger. It has a high-contrast, photo-emissive graphical display, readable even in sunlight. It logs up to 3800 points in manual or auto mode.