Clamp analog ammeter BLOW 51-020#, measuring current up to 20 A, analog display, side jaw

The BLOW clamp analog ammeter 51-020# is a handheld measuring instrument for measuring electrical current up to 20 A. It features a side-opening jaw for quick clamping around conductors and an analog pointer display that provides a direct visual reading of current levels. The device is intended for basic diagnostics, circuit verification and quick spot checks in residential, commercial and light industrial electrical work.

Advantages

The side jaw design allows fast access to conductors in confined spaces without disconnecting wiring. An analog pointer display gives continuous, easy-to-interpret feedback of changing current values. Compact, lightweight construction supports portable field use and simple one-handed operation. The instrument's range up to 20 A covers common household and small-installation current measurements.

Suitable for

• Measuring AC and DC currents in household circuits and appliances (within the specified range)
• Quick verification of wiring and loads during installation and maintenance
• Field checks by electricians, service technicians and hobbyists

Key specifications

• Maximum measurable current: 20 A
• Display type: analog pointer
• Jaw orientation: side-opening clamp
• Form factor: handheld, portable

How to use

Place the instrument in a stable position and ensure the meter is set to the appropriate current range before measurement. Open the side jaw and clamp it around a single conductor only; do not clamp around multi-core cables or grounded bundles. Read the current value from the analog pointer against the scale. For DC measurements observe correct polarity indications if provided by the instrument. After use, open the jaw, remove the meter from the conductor and store it in a dry, dust-free location.

Usage recommendations

Verify that the expected current does not exceed the instrument's maximum rating before measuring. Wear appropriate personal protective equipment and follow local electrical safety procedures when working on live circuits. Avoid exposing the meter to moisture, excessive heat or mechanical shock to maintain measurement accuracy and device longevity.