LM92 temp problems - again

Hi to all.
I have 2 lm92's connected to a controller. One reads 22 deg C and the
other reads 24.5 deg C.
How can they read such different temps. They are within 1cm of each
other in free air. There are just 4 small wires from each to the
controller board.
Is there a problem with these sensors that make them read such
different temperatures.
During soldering none of the legs were heated for more than about 1s at
a time.
cheers
Rob

.

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