The Steep Slope Meter combines the features of the "No. 1" and the "No. 2NS".  The "SSM" is used to determine "percent of grade" and is calibrated to read from 0-50%.  The "SSM" is used in applications where a steeper slope reading is required (as compared to the "No. 2NS"), but the operator or engineer requires a reading in "percent of grade".  This product works well on bulldozers and similar equipment. 
Manual and Brochures
Download the Slope Meter Brochure
Download the Slope Meter Instruction Sheet
Download the Slope Meter Slope Conversion Tables