9 Apparatus and devices for the analysis of liquids and/or gases, in particular combustible and/or non-combustible process gases and/or water; Apparatus and devices for discrete and/or continuous measurement of liquid and/or gas properties, in particular for the measurement of state variables and/or gas compositions; Apparatus and devices for discrete and/or continuous measurement of the pressure, temperature, quantity, heating value, combustion value, Wobbe index and/or density of gases; Gas calorimeters; Apparatus and devices for the discrete and/or continuous measurement of the pressure, temperature, quantity and/or density of liquids, in particular water; Electric regulating apparatus, namely, pressure regulators for gases; Pressure recorders, in particular strip chart recorders, for measurement and recording of the pressure and temperature of liquids and/or gases; Data loggers, including multi-channel data loggers, for the measurement, displaying, storage and transmission of data on liquid and/or gas properties, in particular state variables; Pressure data loggers for the measurement, display, storage and transmission of gas pressures and/or water pressures; All the aforesaid goods for online analysis and/or online measuring also; Pressure test cases containing apparatus for conducting pressure tests in gas and/or water pipelines; Electric insulation testing apparatus for localizing and repairing corrosion damage to tanks and pipelines, in particular plastic-coated tanks and pipelines; recorded and downloadable computer software, in particular for evaluating measurement data in connection with all the aforesaid goods; recorded and downloadable evaluation software for evaluating measurement data, in particular measurement data received in the context of gas and/or liquid analyses; Casings for housing one or several of the aforesaid devices; Calorimeter casings for housing gas calorimeters; Essential parts and accessories for all the aforesaid goods, namely, adapters, batteries, blocks, namely, input blocks and solenoid valve blocks, burners, cables, carrying cases, central units, control units, communication, fans, axial fans, filters, flow, heat exchangers, hoses, manometers, orifice air/gas, power supply units, pressure regulators, pumps, sensors, specific gravity sensors, thermopiles, transformers, valves