In order to bill customers by weight for the refrigerant you have given them, a scale must be ?Type? certified. Additionally, the use of ?Calibrated? or ?Certified? scales is already mandated in some parts of the world. The TIF9010C is among the first ?Type? certified units available on the market. Complies with US (NTEP) and European (OIML) standards, this unit is Legal for Trade in most of the world!