Today during maintenance we positioned one Bartington 3D magnetometer in the WEB SAS close to the cable trays, at the same height as the bottom tray about 50cm away from the tray. Pictures of the installation are attached. The probe names are:

• ENV_WE_MAG_TEST_X - oriented towards East 
• ENV_WE_MAG_TEST_Y - downwards
• ENV_WE_MAG_TEST_Z - paralllel to cable tray going North

The probes started taking data at about 9:15 UTC. At 9:48 UTC we switched off the lights of the hall.