I don't know what the rule is in snooker, but using anything as a measureing device is a foul in pool. There is a fine line, here. Using you cue stick as a pointing device is perfectly find, however, if you let go of the cue stick at any point, it becomes a measuring device and a foul has been comitted.
At home, to develop your eye for seeing if a ball can pass or not--go ahead, just don't do this in public.
I am not 100% sure of the penalty, but i would assume it would the value of the ball you are on.
i.e., if you are measuring to get through to a color, it would be the value of that color. Black 7 points, pink, 6, blue 5, brown 4. The minimum penalty is 4 points for any foul. Yellow and green are worth 2 and three respectively, but a foul on either is worth 4. If you committed the measuring foul in a tournament, it could be loss of frame. But you probably would never see any player commit it.
It is a 7 point penalty in both WPBSA and IBSF rules.
They are written exactly the same but the section reads:
(d) A penalty of seven points is incurred if the striker (i) uses a ball off the table for any purpose, (ii) uses any object to measure gaps or distance, (iii) plays at Reds, or a free ball followed by a Red, in successive strokes, (iv) uses any ball other than White as the cue-ball for any stroke once the frame has started, (v) fails to declare which ball he is on when requested to do so by the referee, or (vi) after potting a Red or free ball nominated as a Red, commits a foul before nominating a colour.
Snooker is one of my favorite sport and I love playing snooker and I am completely aware of snooker rules, following are the basic rules that would be helpful . 1. As there are 15 red balls and six coloring balls, it is must required to pocket the red ball first. After pocketing red ball then you have to pocket any of the coloring ball and the chain goes like this till all the red balls are pocketed and there would be only six coloring balls 2. Now these coloring balls are pocketed in correct order, following is the order yellow ball then green ball, brown, blue, pink and at last black ball.
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