If a training company has been accredited by the ASTQB, they will include it in its general marketing effort. The ASTQB presents itself at conventions and will identify you as an accredited training provider. ASTQB will put your company brochure on display at its booth. Accredited training companies are listed on the ASTQB website and linked to from there. Above all, however, the ASTQB will always send a representative to administer an exam at your training location (restrictions apply).