Gas flow monitors; Decompression chambers; Hyperbaric oxygen chambers, not for medical purposes; Ultrasonic diagnostic apparatus, not for medical purposes; Pressure gauges; Mechanical devices, namely, dispensers of preset portions of fluids, solid granules and powder for dosing purposes, all not for medical use; Barometers; Self-rescue apparatus, namely, oxygen breathing units; Respiratory masks to prevent injury due to dust inhalation

oxygen sensors