The Labnax 500 by Labtest is a chemistry and biochemistry analyzer having a throughput of up to 560 tests per hour. Methodologies available include 240 optical tests and 40 calibrated tests. The unit?s photometric system features a diffraction grating with 12 different wavelengths in a range from 300 to 800 nm. Bichromatic measurements are made possible through the use of a secondary wavelength. The unit can accommodate 60 reagent positions in the tray. 20 ml, 40 ml, 50 ml, 70 ml, and 100 ml bottle sizes can be accommodated. Reagents can be identified by bar code. The unit features automatic washing of the reaction curvettes using a heated water, alkalin and acid solution. The unit also features internal and external sample probe washing.