Photometer   This unit is being sold for parts because we could not get a stabilized reading out of the unit. The numbers on the display keep changing when it is performing a reading on a sample. This may be something that is easily repaired by someone with more knowledge than I have with these units. Spectrophotometer -  Sample Volume only 0.4 ml -  Both Round/ Square Cuvette -  Gratting 1200 Lines/ mm -  Automatic Zero Function Sopecification: Wavelength : 330-1000 nm Bandwidth : 6 nm Data processing : Microprocessor Sample container : Round and square cuvette Sample Volume : 0.4ml ( Minimum)  Light source : Tungsten halogen lamp 6V 10W Data Output : Analog output, RS 232C Interface, Printer ( Optional)  Standard Accessories :  Square cuvette 1 case of 2 ea; Cuvette Holder 1 pc Power cord 1pc; Dust Cover 1pc Didynium filter 1 case of 1ea