This A-model hygrothermograph has a battery-powered drive that will operate in 1 day, 7 day, or 31 day mode. I use it in 31 day mode with Novalynx 50208 charts. It will also use 7 day 50202 charts.

The manual for the 5020 hygrothermograph may be downloaded for free on the Novalynx website.

Go to Weathertronics catalog page.

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