Oakton Economical Minidrum Hygrothermograph

This hygrothermograph is so compact it will fit almost anywhere; measures just 6.00''W x 7.38''H x 3.88''D.
Hygrothermograph employs a quartz-controlled drive mechanism for constant speed; operates for 6 months on one AA battery (included). Chart rotation period is 7 days. Acrylic cover latches securely to protect paper and pens and is easily removable.