Test Our Monitor Free for 60 Days Risk free trial. No money down. We understand that each project is unique. That’s why we’ll send you one of our fuel tank monitors for free, so that you can find out if it is the right fit for your application. Some eligibility restrictions apply. Learn More Here. Name* Email Address* Phone* Company* Tell us about your project . . .* Submit *Xact Small Tank Ultrasonic System pictured above I chose Xact for the combination of ultrasonic measurements with satellite transmission. We have tanks all through the mountains, and we needed a reliable solution. Xact has the most reliable, bulletproof monitor on the market.