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10. What simple test can I use to verify that my TEC is operating correctly?

Measuring electrical resistance is a good way to check the health of a TEC.

Marlow recommends taking an AC resistance measurement using a digital impedance meter or LCR. Using a standard ohmmeter with a DC input signal will not yield accurate readings, because DC voltage applied across the TEC will generate a temperature change and variations in resistance readings. Nominal AC resistance specifications for Marlow coolers are available upon request.