Used for measuring the intensity of gamma-radiation and x-rays, and detecting beta rays.Grey, rectangular Geiger counter box with two black dials and viewing window with measurement scale. Four slits in top with setting dial on upper right side.Embossed sticker (top of front): 'CALIBRATED DEC. 68 / MULT. READINGS BY I.3' Labels on dials and measurement viewing window.radiameter, geiger counters, radiation measurement, scientific equipment, frieseke & hoepfner, germany