Ergonomically shaped ABS enclosures, especially designed for use as hand-held instruments enclosures. The Model "OK-2" has on the cover a recessed area suitable for a keypad membrane or a wide screen 4,3 " TFT Display. The models with "-B" have a battery compartment for two 1,5V (AA) or one 9V flat battery (PP3) while the models with "B2" have a battery compartment for four 1,5V (AA) or two 9V flat batteries (PP3). Matt surface finish. Closing by four screws.
