JJC SL series 2in1 Spirit Level Hot shoe Protector is mountable and efficient design centering the bubble within a circle over your hot shoe. You can easily see whether the bubble is centered, and this level takes up much less space than a large acrylic block.
* Slides into your hot shoe, remains unobtrusive
* Innovative circular design takes up less space than blocky 2-or 3-axis levels
* Rubberized surface for better handling
* Easier to read than see-through levels
* Slenderdesign takes up very little space–highly portable and efficient