I always have a max / min thermometer in the greenhouse. Last year the one I'd been using for years went funny and started reading about 10 deg different on the max and min sides. I'd had it for about 10 years so assumed that it'd broken so invested in a new one. However the new one isn't reading right either and I think it has bubbles in the tubes. Does anybody know what I can do to get rid of them and get it back working OK. Note that I've already tried putting it in the freezer to force it one direction and have tapped it for England (I've probably got RSI now
). Help needed as it's really annoying me. Thanks
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