Scientific, electrical, optical, monitoring and measuring instruments, namely, instruments for measuring thinkness of coatings, alloy composition, material analysis, [ porosity, electrical conductivity, ] content, [ micro-hardness, ] and other properties of coatings and layers; computer and data processors for use in the aforementioned measuring instruments; [ blank magnetic computer tapes and floppy disks for recording magnetic, optical and electronic data; ] thickness measurement instrument...