CASIO SL-797TV
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Date of acquisition: 2012/11/12
From: 

 Casio SL-797TVGD
 Casio SL-797TVBK
 To update the tax rate

 switch on the machine

 press "Rate Set" for 2 seconds

 press "TAX+" : the actual rate appears

 input the new rate (example : 6,55957)

 press "% set" once more
 the rate is updated