Apparatus and instruments for measuring temperature, not for medical purposes, namely, thermometers, glass thermometers, dial type thermometers, laboratory thermometers, thermometers with contact, electronic thermometers, machine thermometers, thermometers with electric teletransmitter, measuring transformers, electric and electronic analyzing and indication apparatus for measuring transformers, namely, flow indicators, temperature indicators and flow meters; electric measuring amplifiers, not including amplifiers for scales and scale parts; apparatus for measuring and monitoring flow, namely, flow meters, flow switches and flow sensors for monitoring and controlling the flow of gases or liquids; water meters; water cost allocators; leakage warning systems comprising flow sensors and leakage warning indicators and alarms; flow measuring apparatus for allocating and billing of costs, namely, gas meters, water meters, and flow sensors; radios for electronic monitoring of the flow of water and gas; control and indication systems for temperature, humidity, flow and level comprising temperature, humidity, flow and water level sensors and transmitters for transmitting a signal indicative of either temperature, humidity, flow or level of liquids or gases; humidity sensors; water sensors and level sensors for liquids; calibrators for temperature, humidity, flow and level; switches actuated by temperature, humidity, flow or level, namely, temperature, humidity, and flow or level switches for monitoring or controlling the flow of liquids or gases; apparatus for monitoring flow systems for fluids or gas in buildings, namely, gas meters, water meters and flow sensors