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Outdoor waterproof maximum and minimum temperature reader/ sensor

Now that the night time temperatures are dropping, my cold frame is in use again. Could anyone recommend a reliable max/ min thermometer or sensors that I can buy. I’ve had 3 battery operated ones in the last 2 years, they just seem to pack up for no reason despite the batteries being changed. Just had a look on Am***n and the choice is incredible. Is it worth paying more to get a better system? 

Life's tragedy is that we get old too soon and wise too late.


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