Log LEM2-1M is intended for measuring speed-through-the-water of displacement-type and hydrofoil vessels.

Three basic modifications of log LEM2-1M are available, which differ in types of induction receivers and the ways of their installation onboard the ship: in the gate valve flush with the ship's bottom; in the gate valve with 150 mm projection from the ship's bottom; fixed on the stationary part of the hydrofoil vessel wing. The log satisfies the requirements of the Russian Maritime Register of Shipping.