170DHII

Powersource: AC, no need for batteries or adaptors
12 Digit extra large fluorescent display with punctuation
AC Desktop printing calculator
2-colour printing for easy recognition of negative numbers Tax calculation - will add or subtract a predetermined tax rate. Ideal for G.S.T.
Business calculation - will easily calculate cost, sell and margin
Angled display to reduce reflection
Decimal positions: +,6,4,3,2,1,0,F
Size: 265 x 189 x 61mm
Weight: 874g

The P170DHii has all the features such as tax, and business functions (calculates cost, sell and margin), as well as calendar/clock functions. The P170DHii has a spacious keyboard in a compact Canon

TX220TS

Dual powered, solar with battery back-up
12 digit LCD screen with punctuation
Large easy to read, adjustable tilt display
Tax calculation - will add or subtract a predetermined tax rate, ideal for G.S.T.
Business calculation - will easily calculate cost, sell and margin
Memory, percentage and square root functions
Backspace and sign change keys
Decimal positions: +,4,2,0,F
Battery and solar powered
Size: 145 x 145.5 x 30 mm
Weight: 166 g