Yeah, the Redwood putter has a 15ft meter, but in all honestly I still prefer to use the 30; even on the shorties. You can kinda just ram it in the center without any issues.
Also, the putting guide that danohi50 suggested can be found by clicking 'Putting Tips' under the FAQ section just to the right of this post. Try checking that out for tips on how to more concisely measure your power.
Good Luck =)