These inexpensive minidrum hygrothermographs are ideal for monitoring ambient conditions in laboratories, greenhouses, museums, libraries, and more. They are so compact they fit almost anywhere, including tight spaces such as under fume hoods or inside environmental chambers. This compact hygrothermograph is our most economical model. The drive uses a quartz-controlled, humidity sensing coil for accurate, consistent readings. Operates for six months on one AA battery and features a corrosion-resistant acrylic housing. Includes 1 sheet of 7 day (172 hr), °C chart paper (3.6"H x 8.1"L) and one AA battery. Comes with a built-in LCD clock in base lets you view time at a glance. Order additional chart paper and pens separately. Dimensions are 4.9" x 7.3" x 4.3" and the shipping weight is 3 lbs.