Profile: Marshall Scientific specializes in selling refurbished laboratory equipment. Our lab equipment is re-conditioned for a wide variety of laboratories including public and private companies, educational institutions, and hospitals. We offer autoclaves, centrifuge rotor, freeze dryers, bio-safety fume hoods, gas monitors, microplate readers, lab furniture, pH meters, spectrophotometers, and mixers. The Agilent 8453 UV-Visible spectrophotometer uses a photodiode array (PDA) for simultaneous measurement of the complete ultra-violet to visible light spectrum in less than one second.