Which instrument is used to check if a circuit is closed or intact but doesnt provide any accurate measurement of resistance?

The instrument used to check if a circuit is closed or intact, without providing accurate measurements of resistance, is a continuity tester. It typically consists of a battery, a light bulb or LED, and two probes. When the probes are connected across a closed circuit, the bulb lights up, indicating continuity. However, it does not measure the actual resistance value in the circuit.