The DICKSON® TempTrace SL4 Temperature Recorder combines an unbeatable combination of durability, accuracy and affordability. The SL4 Temperature Recorder is portable, simple to use and provides a permanent 7-day record of temperature trends in a selection of ranges. Small 4" diameter chart size increases portability and allows installation in most sizes of temperature shelters. The Temperature Recorder adds a convenient digital display for quick monitoring checks. Each unit includes one AA battery, pen, one box of 60 charts in an assortment of temperature ranges, and an instruction manual.