Air analysis apparatus; Alcohol breath testing units; Alcoholmeters; Clinometer; Clinometers; Height measuring instruments; Infrared detectors; Infrared detectors for use in military, law enforcement, civil, scientific and industrial applications; Metal detectors; Metal detectors for industrial or military purposes; Metal hardness testing machines; Metal strength testing machines; Spherometers; Sprinkler heads for fire sprinklers; Sprinkler systems for fire protection; Storage racks for helme...