9 Single pole and dual pole electric current testers; tools for length measurements, in particular vernier calipers and rules; length measuring apparatus of plastic, rules (measuring instruments), folding rules, telescopic rules; scale attachments being parts or accessories (included in this class) for measuring instruments; slide calipers, dial indicators, dial gauge apparatus, length measuring apparatus with scales and/or electronic digital displays; surveying instruments, angles being goniometers and angle gauges, protractors measuring instruments, spirit levels; plane tables and measurement gauges being accessories (included in this class) for measuring instruments, namely, for holding measuring instruments and hand-operated measuring instruments; electric and mechanical torque testing and measuring apparatus