Frigiddaire 50 pint dehumidifier question

I have this unit. It works fine, but the settings on it are 50, 60, 70% and continuous. I read a review on this unit a while back where a person plugged the unit into an external dehumidistat and put the dehumidifier on continuous setting. He said the external dehumidistat settings ranged from 20% to 80%. He said the external unit did a good job of controlling the dehumidifier. I would like to be able to get my Frigidaire down to 20 to 40% when needed. I have my woodshop in my basement and on real humid and rainy days I want to set it to a lower level. I don't want my saw table top or other tools to be in danger of rusting. My question is, do any of you know where I can buy an external unit? Thanks for your help.
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50% is low enough, on continous would it even have the capacity to lower it more, if it does why not just use it on continous
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If it does not rust at 50% on a normal day, it won't rust at 50% on a rainy day. At a given temperature, 50% is still 50%. The unit may work more often to maintain though.
Use Top Cote on the cast iron anyway.
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Dave wrote:

Humidity doesn't hurt you. You're just wasting energy and producing more C02.
--
Blattus Slafaly ? 3 :) 7/8

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That's good if I'm producing more CO2, the plants in my house can use it, that way they'll produce more O2 for my family to breath. I don't believe any of the crap the Al Gore-ite's are spewing out.
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