Bosch GCL 2-50 C Professional Combi Laser + RM2 Mount (4 x 1.5 V LR6 (AA) Batteries) : Bosch GCL 2-50 C Professional Combi Laser + RM2 Mount (4 x 1.5 V LR6 (AA) Batteries) The Bosch GCL 2-50 C Combi Laser can be used for various levelling and transfer job