Designed to slip easily into the bed of a pick-up truck, Seraphin® Slip-On Volumetric Calibration Unit can speed the job of calibrating multiple fuel dispensing units, while at the same time, enhancing safety. The unit consists of three 5 gallon or 20 liter NIST compliant bottom drain provers individually plumbed to 80 gallon stainless steel transfer tanks. The 80 gallon configuration allows for up to 48 calibration tests before returning to the fuel station's storage tank for dumping.