Aim level in elevation for a 150/45 Munáiz-Argüelles cannon, designed by Captain Maldonado, manufactured by the Precision Workshop in 1908. A year earlier, this level had already been declared regulatory for the Ordóñez coast cannons. The level embodies the elevation angle for the range selected on the range disc (metallic colored disc). Placing the apparatus in the tube, the aim was materialized by centering the bubble of the level on its references.