The BaroTROLL Data Logger with can be used with the Aqua TROLL 100/200 or Level TROLL 400/700 water level loggers for atmospheric compensation. Or use it with vented systems to calculate barometric efficiency. Sub-1-inch construction fits smaller-diameter wells and user-friendly Baro Merge software efficiently post-corrects multiple data logger files from a single unit. Get reliable data and years of service from this rugged instrument with titanium construction and long-life batteries. And easily connect to your telemetry for real-time data and alerts.