Analog Clamp Meter BLOW 51-520# — Mini 20 A with Shunt (amperage, power, analog display)

BLOW 51-520# — Mini 20 A analog clamp meter with shunt is a compact measuring instrument designed for basic current and power checks. The device integrates a small clamp for direct AC current measurement up to 20 A and a separate shunt connection for extending measurement range and improving accuracy on higher currents or DC circuits. The analog needle display provides immediate, continuously updating readings suitable for quick diagnostics and routine electrical maintenance in residential and light commercial environments.

Advantages

The instrument combines a mini clamp and shunt input to offer flexible measurement modes without relying on complex digital menus. Its analog pointer display delivers clear, real-time indication of current and power values, making it easy to observe fluctuations. The compact, handheld form factor supports portability and access in confined spaces. Designed for straightforward operation, the meter requires minimal setup for common measurement tasks.

Suitable for

• Quick AC current checks on household wiring and appliances (up to 20 A)
• Basic power measurement and verification in small installations
• Routine electrical maintenance and simple troubleshooting
• Field service work where compact, portable measurement tools are required

Key specifications

• Measurement method: analog clamp with separate shunt input
• Maximum clamp current: 20 A (built-in mini clamp, AC)
• Shunt input: for extended range and DC or higher-current measurement using external shunt
• Display type: analog needle (pointer) for continuous indication
• Functions: amperage measurement, basic power parameter checks
• Form factor: compact, handheld meter suitable for tight spaces

How to use

Place the meter in the desired mode and position the mini clamp around a single conductor to measure AC current up to the built-in clamp limit. For measurements beyond the clamp’s native range or for DC measurements, connect the external shunt according to the shunt and meter instructions, ensuring secure and correct polarity connections. Read values directly from the analog needle; allow a few moments for the pointer to stabilise. Observe standard electrical safety practices: de-energise circuits when required, use insulated probes and gloves as appropriate, and avoid clamping around multiple conductors simultaneously.

Usage recommendations

For reliable results, verify zero and pointer calibration before each session, keep the shunt and clamp contacts clean and free of corrosion, and avoid subjecting the meter to mechanical shocks or moisture. Use the clamp for quick AC checks and switch to the shunt method for measurements that require better accuracy or DC capability.