Instead of waiting for a spirit (bubble) level to move and having to check its position, the MDT LRA SEND iT – MV3s LEDs are 3-5 seconds faster and are easier to see. There are also 5 sensitivity settings to choose from, enabling flexibility to adjust to the precision needed for the task at hand. See if youre rifle is level and how to adjust without taking your eyes off of your target. The LEDs are clearly visible in your peripheral vision and the brightness can be adjusted for better visibility in bright or dark conditions. The MDT LRA SEND iT – MV3 is designed to fit on your rifle in a variety of positions, so you can place it exactly where you need it. The picatinny mount can be flipped for left and right side mounting, or can be removed for use with optional mounting accessories. The MDT LRA SEND iT – MV3 is calibrated on 12 axis to ensure that you have accurate readings regardless of the angle of fire. This is impossible to achieve with any mechanical/spirit shooting level.