Grounding monitor. Overfill controller. Valves. Meters. Loading racks can get cluttered and unsafe! The grounding monitor and controller solves these problems. The device monitors single-compartment, top-loading operations. The grounding monitor provides multiple trucks and railcar grounding options, with enhanced features that include overfill monitoring and spill prevention, loading arm position monitoring, enabled dead-man control, and logging of external and internal temperature and humidity. -AY