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The HP-6S is a metal-cased pocket calculator with rubber keys. Poor keyboard input due to spongey rubber keys, but a good design otherwise. Had nice feature and function set. The calculator was fairly durable, but touch keyboarding is not really possible with this paticular rubber keyboard. Not really on par with a similiar featured and sized Casio FX-250 / 260. But it is very small and compact and would travel well. Cost was usually around/under $10.