Geluid level meters GM10 123dB SPL Bestel GM13 162dB SPL Bestel GM14 162dB SPL afneembare MK16 mic Bestel GM12 123dB SPL afneembare MK07 mic Bestel GM11 123dB SPL afneembare MK08 mic Bestel GM15 123dB SPL 19” rek versie/3 MK07 mic Bestel