noun
mains-powered calculator
Technical computing term for a calculator that runs on AC mains power rather than batteries.
この研究室では、商用電源式計算器を常時接続して使っている。
In this lab, we keep a mains-powered calculator plugged in and use it continuously.
Compound of 商用 (commercial use, mains power), 電源 (power source), 式 (type), and 計算器 (calculator). The derivation is transparent from its components.