If you are talking about the side judge, he uses that to keep track of downs, much like the Umpire having the true "game clock". *All of the officials on a football game usually wear one of the down-indicators, although some wear two (one for downs, one to keep track of where the football was positioned - on the left, right, or between the hashmarks). Also, it is the line judge who usually holds the "official" time.
A wrist band is part of a football referee's uniform and is used to keep track of downs. For example, the band looped over the index finger means it's first down, over the middle, second down, and so on.
Wearing a rubber band on your wrist can be used as a reminder of a pass struggle or a prevention of repeating the same mistake by snapping the rubber band when ever you get the urge.
There called power morphers
The bands are worn around the wrist by the referee and are used to keep track of what down it is by placing the loop that is attached to the wristband around the first, second, third or fourth finger. they look cool.
ESD wrist band is used to release static electricity build up in your body. It is a safety measure to ensure there are not any short circuits on a computer while working on its components.
There's actually two pulses in your wrist. The most commonly used and easiest to find is your radial pulse. The radial pulse can be found by starting at your thumb and moving down to your wrist. Your ulnar pulse is harder to find and is found on the opposite side by tracing down your pinkie finger.
Kennedy key is used in case of wrist watch.
A kind of wrist band with a wire attached to it and other end of wire attached to the body of CPU.
This is likely the down indicator used to keep a visual track of which down it is (the down marker can be wrong). By shifting the band from finger to finger after each down, the officials can immediately tell what down it is from the position of the bands.Some umpires have another purpose for the band. They use it to keep track of where on the field (horizontally) the play started. So for a return to the previous spot (say for a penalty), there is a record of whether the play started at the left hashmark, the right hashmark or some general area of the middle of the field.
The artery generally used to find the pulse (in the wrist) is called the ulnar artery. The radial artery is the artery used to check the pulse in the wrist.
The radial artery is the one that is used to take a pulse at the wrist.
The main joints in action are the fingers, wrist, elbows, shoulders. It is a fact however that the whole skeletal frame is used to transmit the energy to the these areas to move the ball.