Japanese Electronic Dictionary (Casio XD-G9850)
When I was working in Japan, I took the opportunity to buy a Japanese Electronic dictionary (ι»εθΎζΈ, or denshi jisho). I went to the BIC Camera store in Akihabara, and bought a Casio EX-word dataplus 10 model XD-G9850 denshi jisho, which includes specialised dictionaries for Maths and Science.
Why Use a Dedicated Dictionary?
Why use a dedicated japanese dictionary instead of an app on a smart phone?
Pros
Has a long battery life (>120 hours), whereas a smart phone app will quickly drain your phone’s battery