The Vanguard X-811 is an arithmetic calculator with 8 digits precision and algebraic logic. It has 5 functions, 20 keys, and an LED (light-emitting diode) display, typical of calculators of this era.
Facts at a glance:
If you have a Vanguard X-811 that is no longer working, you can consider replacing the calculator with a modern equivalent. We suggest the following current models as possible replacements: