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You can purchase just the main program (PGM) key which will enable you to go to every position on the key lock.  You may also require an operators (OP) key so that you can leave a key in the cash register for the staff which enables them to go to the OFF and REG positions but nowhere else (for example Z). 

On many models you can also use a manager key (M, goes from the RF position round as far as the X position) and an owners key (OW, goes to every key position except PGM) for greater security. These additional 2 keys are included with the full set.

NB. The key you receive may not be quite as pictured, It may be supplied without the plastic coated handle.  Please see other image.

Compatibility: 

Casio 140CR, Casio CE-300, Casio CE-6000, Casio CE-6100, Casio SE-G1, Casio SE-S10, Casio SE-S100, Casio SE-S300, Casio SE-S400, Casio SE-S2000, Casio SE-S3000, Casio SE-C450, Casio SE-C2000, Casio SE-C3500, Casio SR-S500, Casio SR-S4000, Casio SR-C550, Casio SR-C4500, Casio TE-2000, Casio TE-2200, Casio TE2400, Casio TE-M80, Casio TK-800, Casio TK-3200, Casio TK-6000, Casio TK-6500, Casio TK-7000, Casio TK-7500, Casio TK-T200, Casio TK-T500