Humidity switches are still (just) available using the same principle. A thin plastic tape which changes length with humidity. Anyone know what the actual material is?
Honeywell Berns Air KingAdjustable Dehumidifier Control Humidistat H46A C-4145-4 | eBay
Ranco Adjustable Humidistat 250v 3.3A HUMIDITY CONTROLLER Dehumidistat J10-6503 | eBay
Honeywell Berns Air KingAdjustable Dehumidifier Control Humidistat H46A C-4145-4 | eBay
Ranco Adjustable Humidistat 250v 3.3A HUMIDITY CONTROLLER Dehumidistat J10-6503 | eBay
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