Detection method: engine electromagnetic induction Laser reflective Measuring range:30-600mm Resolution:0.1/1 MULTIFUNCTIONAL ENGINE TACHOMETER GED-2600Application: 2 in 1 (Engine & Laser tachometer ) Applicable to the product departments of motor, fan, paper-product, plastics, chemical fiber, washing-machine, automobile, airplane, steamer etc. Application: 2-CIRCLE 1,2,3,4-cylinder4-CIRCLE 1,2,3 ...