"A DIRECT READOUT PHOTOMETER;OVERALL DEPTH IS 1-5/8 INCHES;ACCURATE TO WITHIN +/- 1%;FILTER WAVELENGTH PEAKS 425,485,510,555,609 AND 670 MM;BANDPASS10NM;SAMPLE SYSTEMS 13-MM AMPULES;TUNGSTEN LAMP LIGHT SOURCE;BLUE ENHANCED SILICON PHOTODIODE DETECTOR;2-LINE,16 CHARACTER ALPHANUMERIC LCD DISPLAY;POWERED BY 4 AA BATTERIES;BATTERY LIFE OF 4000 READINGS"