Hopkins MFG 09516 RV Trailer Camper Jacks & Levelers Surface Level-Never Fade (1) RV Level; Never Fade (TM); Bubble; Levels Surface/ Horizontal/ Vertical; Black; Single Indicates Level Three Ways: Horizontal, Vertical And Surface Easily Plumb, Level And Plane From A Distance Multiple Leveling Uses: Shop Equipment, Picture Frames, Gaming Tables, Etc