The Bowmonk MK-III is an accurate mechanical brake meter approved by the MOT and the DOT. It consists of a finely balanced pendulum free to respond to any change in speed or angle, working through a quadrant gear train to rotate a needle around a dial. The MK-III’s dial is calibrated is percentage G, the accepted worldwide standard for measuring acceleration. To dampen out vibration, the instrument is filled with a special fluid that is not sensitive to temperature changes.
The MK-II is completely maintenance free