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.
30-06 Arrow Snot Arrow Release Fluid $18.75 
Standard Manufacturing SP-12 Compact Pro 12 GA 14.5" 5rd Shotgun $360.89 
Saunders Archery Firing-Line Release Trainer
$129.95