Digital multi-purpose clamp meters uses 

1. Measuring Current: The primary function of a clamp meter is to measure electrical current. It can accurately measure both AC (alternating current) and DC (direct current) without the need to interrupt the circuit.
2. Non-Invasive Current Measurements: The clamp feature allows for non-contact or non-invasive current measurements by clamping around a conductor, making it convenient and safe for technicians.
3. Voltage Measurement: Clamp meters can measure AC and DC voltage levels in circuits. This is useful for troubleshooting and verifying the voltage in electrical systems.
4. Resistance Measurement: These meters can measure the resistance of electrical components, helping technicians identify faulty or damaged elements in a circuit.
5. Continuity Testing: Many clamp meters have a continuity testing function, which helps in quickly identifying the continuity of a circuit by producing an audible beep for a low-resistance path.
6. Capacitance Measurement: Some clamp meters come equipped with the capability to measure capacitance, allowing technicians to assess the health of capacitors in electronic circuits.
7. Frequency Measurement: Clamp meters can measure the frequency of AC signals, which is useful in various applications, especially in troubleshooting electronic circuits.
8. Temperature Measurement: Certain models of clamp meters are equipped with a temperature measurement feature, enabling users to measure the temperature of electrical components.
9. Power Measurement: Advanced clamp meters may have features for measuring power factors, active power, and apparent power in electrical systems, providing a comprehensive analysis of power consumption.
10. Harmonic Analysis: In some models, there are features for harmonic analysis, allowing technicians to assess and troubleshoot harmonic distortions in electrical systems.
11. Phase Rotation Testing: Certain clamp meters are designed to determine the direction of phase rotation in three-phase systems, ensuring proper connection of electrical equipment.