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UNICO Spectrophotometers S1100 are simple, reliable and economical. Great for use in many types of laboratories, including educational, clinical, industrial and environmental labs. UNICO 1100 Series Spectrophotometers are designed for use with 1/2" (13mm) round tubes or 10mm square cuvettes. Tube holders available for COD, 3/4" and 1" tubes. An adapter is supplied for 10mm square cuvettes. High quality silicon photodiode detector and 1200 lines/mm grating assures high performance. Auto zero function, press-button blanking and built-in filters for easy operation. Large digital display for easy readout. A tool-free and alignment-free lamp change reduces