Searching for a low cost temperature sensor for shallow wells

Does anyone know of a supplier that I could purchase a fairly low cost temperature sensor to run in shallow water wells? 
Max temp expected is about 80-90 degC and max depth is about 150-200m (fluid filled). Accuracy needs to be about 0.1degC. Doesn't need to be surface read out - memory mode more than adequate.
We want to log temp some shallow water wells prior to drilling the much deeper real exploration wells such that we can try to get an early handle on temp gradient in the region. It's just a little project at this stage, so need to keep costs low.
Thank you
Iain

6 Answer(s)

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