UNDERWATER TESTING EQUIPMENT, AND COMPONENTS THEREOF; CHEMICAL PLANT AND LABORATORY EQUIPMENT; NUCLEAR RADIATION MEASURING INSTRUMENTS AND MONITORS; PHARMACEUTICAL FILLING EQUIPMENT; PH METERS; DIELECTRIC MEASURING APPARATUS; MOISTURE DETERMINING EQUIPMENT; CONDUCTIVITY METERS; HYDROMETERS; THERMOMETERS; RECORDING TRANSMISSOMETERS; CURRENT METERS; HERMETIC SEALS; AND MERCURY SWITCHES