Product description :
 Adult Reusable Skin-surface Probe, 10ft, (3.0 m),
25°C@2.25KΩ, Φ6.3 mono plug
Compatible brand : Philips: Philips A3 series monitor Instrument: M3926A, M3927A,M3928A, M3929A;Marquette: 7000/7010,GE,Eagle, Solar, Tram,
Tramscope,MAC-Lab Systems
Probe: diskφ   12mm