phase tester

A device, often built into a screwdriver, used to check for electric current.

Japanese Meaning

電流検出装置 / 検電器 / 相電流テスター

Before restoring power, the electrician used a phase tester to make sure the wires were not live.

電源を復旧する前に、電気技師は配線が通電していないことを確認するために検電ドライバーを使った。

Sense（1）

A device, often built into a screwdriver, used to check for electric current.

phase testers

（ plural ）