sumlock anita 810

this is a fine example in almost perfect condition. the display is 8 digit led whose segments themselves appear to be made up of smaller dots. it is very well constructed and palm sized. the form factor reminds me of the fx-20 or the hp-25, a size i find convenient.

the on switch doubles as a means to select power from an external supply and the other switch selects rounding indicated by a rounded arc. rounding is fixed to 2 decimal places for accounting purposes.

although pocket sized, this unit was clearly intended for use in accounting because operationally it behaves like a desk calculator. that is to say that add does not chain to multiply. so 2*3+1 is not 7. instead, you press 2*3=+, 1+ and to subtract to press, for example, 3- rather than -3. this is exactly how most desk calculators operate like the anita 811sl. a clue to this is the subtle colour shading of the plus and minus keys.