The Pena Jar Tester is a machine for setting, checking, and testing pull loads of a variety of tools with an outer diameter up to 12".  The Jar Tester is capable of exerting tension or compression loads in a controlled manner.  The Pena Jar Tester provides an effective and accurate means for shop testing hydraulic jars setting and checking pull loads of mechanical rotary jars, safety joints, bumper subs, and other similar tools.