Choose the durable HP10SII Scientific Calculator with a user-friendly design, easy-to-read display and a wide range of algebraic, trigonometric, probability and statistics functions for your math and science classes | Enjoy a long-lasting calculator with solar power plus a battery backup so you can work in low-light conditions. Help protect your HP 10s+ from bumps and drops with the durable slide-on cover | View expressions and results simultaneously on a 2-line, 10-character display. Work smarter and faster with dedicated keys for common calculations including percentage, pi and sign change. Store and recall important results and data fast with the easy-to-use memory keys. Display decimals between -1 and 1 in your choice of either exponential or decimal format | Solve math and science problems quickly and easily using 240 built-in-functions. Power through advanced statistics - find mean, standard deviation, variance and more with editable lists. Calculate common probability functions like permutations, combinations and factorials. Perform decimal and hexadecimal (degree/hour, minutes, seconds) conversions. Convert from decimals to fractions