- Rectangular recorder 277 x 277 mm - Case St. Steel AIAISI 316, weatherproof,corrosion restistant - Recording with disposable feltpen on circular recorder charts diameter 223 mm, writing width 80 mm - Mechanical spring wound clock, revolution time 1, 4, 8, 12 or 24 hrs (clockwise) - Viewing window laminated safety glass - A Accuracy Class 1,0 (+/- 1% of full scale) - Connection back - Portable execution with handle & feet.