A strength tester machine is a type of amusement personality tester machine, which upon receiving credit rates the subject's strength, according to how strongly the person presses levers, squeezes a grip or punches a punching bag. In the past, strength testers could mainly be found in penny arcades and amusement parks, but they are now also common in pub-style locations as well as video arcades, bowling alleys, family entertainment centers and disco venues. Modern strength testing machines have become redemption games and use LCDs for a video feedback,[1] while some such as Sega's K.O. Punch (1981) use a video game display for feedback.[2]