Andoer Dual Double 2 Axis Bubble Spirit Level Gradienter Tester with Hot Shoe for Canon Nikon FUJI DSLR Camera This dual axis bubble level is designed to indicate whether a surface is level or plumb. It helps make sure that your photos will actually stitch together when all is done. The dual axis facilitates you when taking photos in both portrait and landscape orientation. It is particularly useful when you mount your camera on a tripod. Fits almost all DSLR/SLR cameras with a standard flash hot shoe except for Minolta and SONY.