https://tankscan.com/
TankScan - Wireless tank monitoring with real time data access
TankScan wireless monitoring measures levels in multiple light industrial liquid tanks, optimizing data, delivery routes, inventories and customer service.
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https://soundingsonline.com/gear/axonrf-inc-wireless-tank-monitoring-system/
AxonRF, Inc. Wireless Tank Monitoring System
Oct 28, 2009 - AxonRF, Inc. introduced the nowire Wireless Tank Monitoring System, which eliminates cumbersome wires between the tank sensors and the display panel.
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