This KAHLSICO hygrograph was marketed by the Kahl Scientific Instrument Company of El Cajon, California.  It probably dates from the 1970s or 1980s.  It is an unusual instrument in that it is very small, the case is only 8 inches long.  It also uses unusually small charts, 2.25 inches tall.  The charts are also unusual in that they have 100% humidity at the bottom of the chart and 0% at the top.  I don't have a chart for it, I reduced another chart to fit the instrument but I doubt that the humidity scale is correct.  If anyone has a chart to fit it, please send me a JPG or PDF of it.

Go to KAHLSICO catalog page.

Go to Home Page.