This is a microscope stage temperature control system that ensures accurate stable thermal control of live biological specimen observations. Ideal for checking semen motility it is sized specifically for the user s stage warming needs and is adaptable to all brands of biological compound and stereo microscopes. The stage warming deck is made high tensile aluminum which maintains a constant temperature less than +/-1° C between a setting range of 20° C to 50° C. Pre-heating the stage takes 1 to 2 minutes resulting in reaching the constant temperature desired. This stage warmer is ideally suited to maintain stable specimen temperatures while examining or analyzing sperm motility and velocity or other live biological specimens under a microscope. It comes with an instruction manual and two spare fuses.