Designed for training as well as tuning. It’s compact and has a draw length adjustment and a 26 lb pull. Great for practicing your form and release when you can’t get to the range. It also aids in setting up your release tension.
Scorpion Venom Arrow Release Fluid $12.99 
Scott Archery Apex Core Release Adjustable Thumb Barrel 3/4 Finger Extensions Ultra-Crisp Release Closed Hook Design Black (8012-BK) $284.99 
Saunders Archery Firing-Line Release Trainer
$129.95 
