As the most prominent independent foundation dedicated to cross-connection control USC FCCCHR maintains the strictest and most well-regarded standards for backflow prevention assemblies themselves as well as for the field test kits.
The USC FCCCHR requires a field test kit that is rugged and reliable, accurate, and all wetted components must be constructed of food-safe materials.
Yes, like all backflow test kits, the calibration of the Mako must be verified by an independent lab standard. How frequently verification is required varies by the purveyor you service but typically is once a year. The verification lab must be properly equipped with an up to date verified standard and have the Mako adjustment procedures.