here is the ti-30 as lcd version. it
is powered by 2 AA batteries and sports constant memory. however
this just means that the value in the memory is retained whilst off
because theres nothing else for it to retain.
it comes in a hard plastic enclosure that protects it well. the buttons
are very nasty click type, they require significant force and soon wear
out and respond intermittently.
the lcd display only copes with 8 digits and a sign. this is poor when
displaying scientific notation as only 6 figures of mantissa can be seen.
internally 11 digits are used, but accuracy in general is poor like the
the scientific offerings are somewhat basic, no hyperbolics or even dms
conversion for trig angles, but operators do take correct precedence.