Acid hydrometers; Air analysis apparatus; Altimeters; Angle gauges; Apparatus for recording distance; Barometers; Diagnostic apparatus for testing food; Digital pH meters; Ergometers not for medical purposes; Gas detectors for detecting the presence of gas; Hygrometers; Laser rangefinders; Precision instruments for manipulation and positioning of microscopic objects; Radiation-measuring instruments; Soil sampling equipment, namely, tubular liners or tubular sleeves