RKI Instruments Rig Monitor System, with Beacon 110 Single Channel Controller, Hydrogen Sulfide (H2S) 0-100 ppm Sensor with Cal Cup/Splash Guard and 25' Cable, Horn/Strobe, and 50' Power Cable with Battery Clamps -
MFJ-890UK - DX Beacon Monitor Accessories for the Shack at £149.99 | Ham Radio