The SNA certificate is a proof that you have obtained the SNA quality mark based on the
NEN 4400-1 or NEN 4400-2 standards. This quality mark exists for temporary workers and hirers and was developed to limit the risks of hirers of labour and clients (your clients).
You can apply for an SNA certificate from the Labour Standards Register (Stichting Normering Arbeid-SNA).
To keep the SNA certificate, you will be checked twice a year by an inspector.