In order to monitor the laboratory's performance, Sino Analytica participates in international proficiency test schemes such as FAPAS, FEPAS and AQUACHECK annually and achieves excellent marks. These schemes are a great aid to Sino Analytica's ambition to become one of the top food analysis laboratories globally. If you just want a quick look check out the "z score "graphs.  In general the nearer to 0 (zero) the better.