The sprayers must comply with the EN standards for application and safety. Sprayers which do not meet this requirement will have to be repaired or decommissioned from use on the farm. This essentially means that all of the estimated 30,000 to 40,000 tractor-mounted or trailed sprayers in the country will have to be tested, as well as the small number of self-propelled machines. This test certificate will remain with the sprayer even if it leaves the farm. It is envisaged that pre-owned sprayers sold will have the option of testing the sprayer which should add to the value of the sprayer. Every sprayer will have to be tested once every five years until 2020 and every three years after that year.