Abstract: A counting device including a wall that delimits an internal space; an object counter that is positioned in the internal space and includes a measuring lens, which optically delimits a detection zone outside the counting device. The wall of the counting device includes an aperture positioned in front of, preferably centered relative to, the measuring lens, the measuring lens and the aperture being arranged to transmit to the counter a flux emitted by the objects present in the detection zone.

Abstract: The invention concerns an electronic housing (100) intended to be fixed under a cover of a manhole, the cover comprising at least a first fixing means and a through cavity, the electronic housing (100) comprising: a shell (102) having a top face, for the or each first fixing means, a second fixing means intended to cooperate with said first fixing means in order to fix said shell (102) under the cover, electronic components comprising a wireless communication module, and a control module intended to change said wireless communication module from an inactive mode to an active mode, said control module comprising a sensor able to react in the presence of a wakeup device, projecting with respect to said top face and intended to be housed in said cavity.