A professional who conducts spectrographic examinations of metal and mineral samples under established procedures, using spectrograph, spectrometer, densitometer, and other measuring instruments. Responsibilities include:

• Analyzes densitometer or spectrometer readings to measure density ratio of specific elements in sample.
• Computes percentage composition of sample by comparing intensity ratio with standard charts.
• Investigates deviations from standard, performing further examinations by other spectrographic procedures and methods to establish degree of conformance to standard.
• Records quantitative determination, procedure, and standard applied for each sample examined.