LEASING OF ELECTRICAL APPARATUS AND MEASURING AND SCIENTIFIC EQUIPMENT AND SUPPLIES AND PROFESSIONAL CONSULTATION SERVICES PERTAINING TO SUCH EQUIPMENT; SUCH APPARATUS, EQUIPMENT AND SUPPLIES IN CLUDE ELECTRICAL TESTING EQUIPMENT-NAMELY, A.C. AND D.C. METERS FOR TESTING AND CHECKING ELECTRICAL METERS, ELECTRICAL DEVICES AND THE LIKE; ELECTRICAL TACHOMETERS, PYROMETERS, ORIFICE METERS, ORIFICE WELL TESTERS, CHART DRIVES AND RECORDERS; PRESSURE ELEMENTS-NAMELY, TUBING, DIAPHRAGMS, BELLOWS, BOURDON TUBES AND THE LIKE; THERMOWELLS; HELICAL BOURDON TUBES; LEVELLING SADDLES; CHEMICAL INJECTORS AND PUMPS, AND MAGNETOS