Microscope stages with three different temperature controllers have been released by Bioscience Tools. The TC-2D is a two-channel universal controller that incorporates digital controls that can be linked to similar units. It has a temperature range to 100 °C, multiple temperature sensors and RS-232 ports. The TC-1 controller has a temperature range up to 50 °C and offers low electrical noise. The BTC-100 offers cooling or heating from 0 to 100 °C and low electrical noise. Each controller has 0.1 °C resolution, analog inputs to set reference temperature and analog monitoring outputs.