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Product Description ------------------- The main feature of the WM-220 that makes it stand out from the rest is that it is splash and dust proof therefore ideal for use outside, in dusty environments or indeed anywhere. It is not only stylish but very robust. It also has TIME calculations which makes adding Hours-Minutes-Seconds so simple. Other features include a 12 digit display - tax calculations - function command signs - 3 digit comma marker - dual power - auto power off - 3 key memory - 4 constants - profit margin % key - double zero key - square root key - correction key. Technical Information Dual Powered (Solar & Battery);Angled Large 12 Digit Display;Tax Calculations;Splash & Dust Proof;Time Calculations;Correction Key (Back Space);Non-stick plastic keys;Key rollover;Auto power off;Profit Margin %;00 Key;Function Command Signs;Sign change key;Large + Key;Square root;4 Constants;3 digit comma marker;3 key memory;Non-stick plastic keys;Rubber Feet;Memory Stored on switch off;Battery back up 1 x CR2032;Weight (g) 132g;Dimensions (cm) 10.4(W) x 13.6 (L) x 3.5 (H);Two year Manufacturers Warranty Why A Casio Model? Pioneering developments for over 50 years, since first inventing the electronic calculator in 1957, Casio are leaders in the development of calculator technologies and mathematical tools. Suitable for daily use, whether you are studying for mathematical qualifications, working on complex financial analysis, wanting time saving desktop assistance or looking for handy calculations whilst on the move. The Casio range of Graphical, Scientific, Desk and Pocket Calculators are powerful and rugged mathematical tools, built specifically for your task at hand. Technical DetailsDual Powered (Solar & Battery) Angled Large 12 Digit Display Tax Calculations Splash & Dust Proof Time Calculations Correction Key (Back Space) Non-stick plastic keys Key rollover Auto power off Profit Margin % 00 Key Function Command Signs Sign change key Large + Key Square root 4 Constants 3 digit comma marker 3 key memory Non-stick plastic keys Rubber Feet Memory Stored on switch off Battery back up 1 x CR2032 Weight (g) 132g Dimensions (cm) 10.4(W) x 13.6 (L) x 3.5 (H) Two year Manufacturers Warranty Box Contains ------------ * WM220T with back up batteries included * Instructions * Warranty Card