Functions: * measure the slope of the surface

* right angle to edge ratio (%) measurement

* measurement of right angle to side ratio (mm/m)

* right angle to edge ratio (IN/FT) measurement, displayed in two ways: decimal and fractional

* optional sound status: sound on or off

* measurement data retention

* horizontal adjustment indication

* memory function 

* low battery indicator

* backlight function

* automatic shutdown if there's no operation in 3 minutes