Question on measuring groups at a match

[kd4avp]

Question for the group.
I am not a group shooter but want to explore getting better at this discipline.
What is used at a match to measure the group?
My first idea would be a caliper of some type.
Just curious what the group shooters are using.

Thanks

 

[newbieshooter]

I've seen these @ SR & LR matches to measure groups:

Neil Jones Custom Products

Custom dies Reloading

neiljonescustomproducts.com

 

[Scott haywood]

I like my Neil Jones for measuring for accuracy but when I'm at the range and just want to get fairly close I'll take my digital calipers and measure the outside diameter hole made by a single bullet. Hole size depends a lot on the target paper used, not necessarly on bullet caliber. Then I'll "Zero" the calipers at this setting and I'll measure my groups outside to outside.

 

[kd4avp]

Thanks Scott & Newbie
I spoke with Neil this morning and ordered one of the measuring tools.
Just using the caliper for myself at the range will work great, but when running a match I wanted to make sure there is a "standard" to measure by. Granted this is just club match, but want to try and keep the playing field as level as possible.