Air analysis apparatus; scales; weighing machines; weighbridges; surveying apparatus and instruments; inductors [electricity]; furniture especially made for laboratories; precision measuring apparatus; measuring instruments; weighing apparatus and instruments; pressure indicators; balances [steelyards]; teaching apparatus; precision balances; flowmeters; thermo-hygrometers; height measuring instruments; gravimeters; automatic ion exchange chromatography apparatus for laboratory use; drying ov...