A professional who tends machine that tests strength of chains. Respnsibilities include:

• Adjusts chain-holding jaws on machine to accommodate size of chain.
• Sets scale dial to specified pounds to regulate pulling power of machine.
• Positions chain in machine jaws and starts machine.
• Examines and gauges chain to detect broken or stretched links.
• May check chain for free operation, roll chain into coil, and place chain in crate.