CALC-AN-ACRE features a large easy-to-read liquid crystal display, easy-to-use rotary dial and lighted display. AREA (1) (2) (3): Three independant counters keep a running count of the total acres (hectares) (thousands of square feet) worked. May be reset. SPEED: Displays ground speed in miles per hour (kilometers per hour). AREA/HOUR: Displays current work rate in acres per hour or hectares per hour or thousands of square feet per hour. TOTAL HOURS: Shows hours of operation (can be reset). RPM: Displays shaft RPM (requires Shaft Sensor Kit P/N 01539). DISTANCE: Displays distance traveled in feet (meters). May be reset. WIDTH +/-: Displays effective working width. Width can be changed on the go, in 25% increments. SUB HOURS: Shows sub hours of operation (can be reset).