🔍 Key Concepts

• Instrument ratings and limitations printed on test equipment (voltage range, AC/DC, frequency) • Difference between polarity sensitivity on DC vs AC circuits • Why using a tester outside its specified range (voltage or frequency) can be unsafe or give bad readings

💭 Think About

• Look at which choice sounds like a general, manufacturer-type precaution that would apply to many testers, not something oddly specific or incorrect. • Ask yourself: is an electronic solenoid voltage tester normally limited only to 120 V, or are there models designed for higher voltages? • Think about whether a typical solenoid-type tester is highly polarity-sensitive on DC, or mainly specified for certain voltage/frequency ranges on AC.

✅ Before You Answer

• Check which option focuses on matching the tester’s specification plate (voltage and frequency ratings) with the circuit you’re testing. • Verify whether it is realistic that such a tester would never be used on 60 Hz circuits, given that most shipboard/shore power in North America is 60 Hz. • Eliminate any option that invents a restriction (like a fixed 120 V limit) that does not match how these testers are commonly rated in practice.