Two-way power (solar + battery)
casio fx 991es-plus scientific calculator is designed and engineered for easy operation. it is solar powered when light is sufficient, battery powered when light is insufficient. the high-resolution screen provides beautiful looking graphs every time.
display: natural textbook display, natural v.p.a.m.
power supply: solar powered with an auxiliary battery
with a hard case
dimensions (h x w x d): 162,0 x 80,0 x 11,1 mm