MSJA144B is a general purpose high quality tally counter or hand counter used to count people for security, accounting or compliance issues. The internal counter made of hard plastic is a self supporting unit complete with its own frame. The metal shell acts as a strong protective cage to add the durability of the internal counter. It has a finger ring that is attached and secured to the metal shell with 2 metal screws. The protective metal shells in this model are very secure because the two metal shells are screwed to each other, not to the plastic frame. Enhanced counting mechanism ensures one count per click and prevents half way digits or partial counts.