ELECTRONIC TEST AND MEASURING INSTRUMENTS AND DEVICES AND ELECTRONIC TEST TOOLS, NAMELY, LOCAL AREA NETWORK ELECTRONIC METERS; ELECTRONIC CABLE MAPPING UNITS; DIGITAL TROUBLESHOOTING SYSTEMS COMPRISED OF COMPUTER HARDWARE AND SOFTWARE USED TO DIAGNOSE AND ANALYZE ELECTRONIC DEVICES AND COMPUTER HARDWARE; ELECTRONIC METERS FOR TESTING AUTOMOTIVE ELECTRICAL SYSTEMS; CURRENT MEASURING CLAMPS; CABLE TESTERS; OSCILLOSCOPES; NAMELY, COMPUTER COMPONENT CALIBRATING EQUIPMENT, TEMPERATURE CALIBRATORS, PRESSURE CALIBRATORS; REMOTE SENSING DATA ACQUISITION TOOLS, NAMELY METERS AND ELECTRONIC MONITORING SENSORS THAT DERIVE INFORMATION FROM WIRELESS, LANDLINE, AND GLOBAL COMPUTER INFORMATION NETWORK CONNECTIONS FOR USE WITH COMPUTER SOFTWARE PROGRAMS, DIGITAL MULTIMETERS; DOCUMENT PROCESS CALIBRATORS; CABLE IDENTIFICATION MODULES FOR USE WITH CABLE TESTERS; PROTECTIVE HOLSTERS FOR ELECTRONIC METERS; AND COMPUTER SOFTWARE AND HARDWARE FOR USE IN TESTING AND ISOLATING FAULTS IN DIGITAL CIRCUITRY; AND PARTS THEREOF AND ACCESSORIES THEREFOR, NAMELY, ADAPTERS, CONNECTORS, CABLES, TEST LEADS, RACK MOUNTS, VOLTMETER PROBES, OSCILLOSCOPE PROBES, CLIPS, CASES AND BATTERY PACKS