Acid hydrometers; Alarms for the detection of inflammable gases; Anemometers; Gas testing instruments; Laser rangefinders; Length measuring gauges; Measuring apparatus for temperature and humidity levels in gases and solid substances; Metal detectors; Metal detectors for industrial or military purposes; Optical inspection apparatus; pH meters; Scanners; Stands adapted for mobile phones; Surveying instruments; Tire pressure gauges; Tool measuring instruments; Ultrasonic thickness gauges; Labor...