I have two Belfort 594 hygrothermographs.

On the first 594 I replaced the original spring-driven 7 day drive with a quartz drive removed from an Oakton hygrothermograph. It provides 1 day, 7 day, and 31 day rotation. I use it in 31 day mode with Belfort 15627 31 day charts. It will also use Belfort 207-W charts in 7 day mode and 207-D charts in 1 day mode.

The second 594 is in original condition with the Belfort 7 day spring-driven movement. I use it with Belfort 207 charts.

​The manual for the 594 hygrothermograph may be purchased on the Belfort website.

Go to Belfort catalog page.

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