The copy had sent me supplied wrong recessed dragonflies. Easy detectable by resting on a horizontal surface: each different measurement results in all directions. To point a camera unusable. Overall, the level made no very robust, so I have to dispense with the appointment of a new copy.
I now use a small, precise spirit level (nearly 10 cm) from the hardware store. The I lay in the hot shoe and teach the tripod accordingly.
