With over 25-years in the RV industry and over 200,000 installations, the SeeLeveL II RV Holding Tank Monitor is a proven, reliable, liquid level monitoring solution. Garnet’s RV monitoring systems are known as “the gauge that works” for a reason. Garnet’s state-of-the-art digital technology provides percentage of full accurate tank measurement readouts - making it one of the most accurate monitors available on the market.