Longines Symphonette LTP 5405
The Longines Symphonette LTP 5405 is an arithmetic calculator with algebraic logic. It has an LED (light-emitting diode) display, typical of calculators of this era. The power source is 4xAA.
Facts at a glance:
If you have a Longines Symphonette LTP 5405 that is no longer working, you can first try replacing the 4xAA batteries. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent.
We suggest the following current models as possible replacements: