Apparatus for monitoring electronic components; apparatus for monitoring electronic instruments; apparatus for recording; apparatus for remote data transmission; control apparatus for the management of communication installations; data processing apparatus; electronic apparatus and instruments for data collection; electronic measurement sensors; electronic monitoring apparatus, other than for medical use; gauging instruments for liquids; instruments for measuring levels of fluids; instruments for measuring pressure; level gauges; fluid level sensors; level sensors; liquid level control apparatus (electric or electronic); liquid level meters; liquid level monitoring apparatus; measurement devices; apparatus for measuring; measurement apparatus; measuring apparatus; remote data gathering apparatus; remote data processing apparatus; remote monitoring apparatus; remote reading fluid level indicators; satellite communication apparatus; satellite communications equipment; satellite communications instruments; satellite communications terminals; satellites for communication purposes; sensor apparatus, other than for medical use; sensors (measurement apparatus), other than for medical use; sensing devices (other than for medical use); sensing devices for the control of liquid levels (other than for medical use); telemeter apparatus; telemeters; electronic apparatus for telemetry; telemetry apparatus; telemetry installations; telemetry instruments; water level detection apparatus; water level gauges; liquid level indicators for water tanks; water level indicators; water quality monitoring equipment; wireless transmission apparatus.