Weighing apparatus and instruments; Apparatus and instruments for weighing; Surveying instruments; Measuring apparatus and instruments, namely, pressure gauges, thermometers, not for medical purposes, gas density indicators, gas density gauges, gas density meters, gas density monitors, gas detectors and gas emission monitors; Measuring, counting, alignment and calibrating instruments, namely, pressure calibrators and gauges, temperature calibrators, gas density monitors, gas density transmitt...