Precision measuring apparatus for liquid flow rate and temperature; snorkels; flowmeters; gasometers [measuring instruments]; temperature indicators; water level indicators; pressure gauges; measuring apparatus and measuring instruments, namely, flow meters, wedge meters, venturi cone meters, orifice plates for metering or controlling the flow rate of liquids, flow nozzles, and thermocouples; switchboards; thermometers, not for medical purposes; pitot tubes