Full instructions on back of packaging on how safely weigh fish - it is important to follow this to ensure safety

Allows two weighs of measuring  

 (1) stick the hook part through the gill plate. DO NOT hook it through an actual gill. for added ease sharpen the hook on the scale so that it can be easily inserted into the bottom lip of the fish.

(2) Place the fish in a plastic bag with handles and no water in the bag. weigh the fish then weigh the bag separately  to deduct from your total weight. 

lightweight and portable 

easy grip handle and hook for attachment 

should not be used for any other purpose

Use extreme care when handling sharp hooks