The Eppendorf PCR-Cooler contains a temperature indicator that changes the color when its temperature exceeds 7 °C. Ideal for PCR set-up.
Cooling curve
Temperature behavior of a precooled PCR-Cooler and a sample inserted at room temperature (the background color indicates the color change)

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Eppendorf is a leading life science company that develops and sells instruments, consumables, and services for liquid-, sample-, and cell handling in laboratories worldwide. Its product range includes pipettes and automated pipetting systems, dispensers, centrifuges, mixers, spectrometers, and DNA amplification equipment as well as ultra-low temperature freezers, fermentors, bioreactors, CO2 incubators, shakers, and cell manipulation systems. Consumables such as pipette tips, test tubes, microtiter plates, and single-use bioreactor vessels complement the range of highest-quality premium products.