Today’s “battery only” calculators are usually very reliable, especially if you use a recognised brand such as Casio, Logik, Sharp, HP, Aurora etc.
Nevertheless, at certain times some schools and colleges prefer the extra reassurance of “dual power” calcs which use both a battery and a solar cell back up.
Two highly recommended dual power calculators are the Logik LK 83XP (from £ 5.29) and the Casio FX 85GT+ (from £ 7.55) ex vat. Both calculators are suitable for KS 3, 4, GCSE and Scottish exams and each has a THREE year guarantee.
Further details about these two calculators can be found on the website of Signpost Educational Ltd., www.signposteducational.co.uk or contact them by phone on:
020 7515 1797 or firstname.lastname@example.org