This measure has evolved purely because the inventor wanting to help a friend who was a disable bowler with one arm who couldn’t use a string measure. As a result,the Impulse Laser Measure was developed which can be used by everybody.
The reason for measuring to the jack is the jack is of a constant diameter and the laser is arranged to aim at the middle of the jack thereby giving consistent accurate measures.
Bowls are of varying size and measuring to the bowl decreases accuracy due to the variable aiming of the laser. Measure up to 4 bowls at a time and compare distances on screen. Measures shorter and longer distances to string measures.