there might be something in that geoff, i have two sensors, one black one like mikes connected to mirror and its ambient sensors, right next to it on the tube is a white one with one end measuring the cold plate and ambient.
now both ambients are not always the same for the black and white ones even though they are right next to each other on the grey steel tube.
the excess leads are rolled up and sits between the two sensors and the tube
??
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