With transverse and longitudinal vials
Used as level and slope meter to measure the angle of two separate surfaces
Aluminum frame
Magnetic bottom
The sea level is permanently set inside the chip, zero setting is not needed when batteries are replaced
Buttons: ON/OFF, absolute and incremental measurement, keep the reading, buzzer alarm(not for 4910-400), unit (mm/m, %, in/ft), conversion(not for 4910-400), backlight
The display flips over when the bottom faces up

Insize 6313-0D275, SETTING RING, .275" dia , 6928640357664
Dynabrade 78727 3/16" x 1/2"-W154 Dynacut A/O Mounted Point, Vitrified, 5/pack
Dynabrade 92721 1" W x 150' L 30 Micron A/O Microfinishing Film DynaCut Roll
3M 01304, Scotch-Brite Cut and Polish Flap Brush, 6 in x 1 in x 2 in 5A MED, 7010366062 