Gardner Bender GMT-318 Analog Multimeter — 6 Functions, 14 Range, 500V

Overview

The Gardner Bender GMT-318 Analog Multimeter is a compact, reliable testing companion designed for homeowners, hobbyists, and professionals who need quick electrical and electronic measurements. Its color‑coded analog display provides immediate visibility, while a built‑in mirror scale helps reduce parallax errors for clearer readings. This pocket‑sized meter balances simplicity with practical capability, making it a versatile addition to any toolbox.

What this meter measures

Capable of 6 functions across 14 ranges, the GMT‑318 tests AC and DC voltage up to 500 V, DC current, and resistance across typical Rx1, Rx10, and Rx100 settings. It also handles a modest decibel range for transistor gain considerations on AC voltage ranges, and supports battery checks from common household cells.

• AC and DC voltage up to 500 V
• DC current testing with a 250 mA range
• Resistance measurements up to 50 kΩ
• -20 to +56 dB decibels for transistor gain assessment
• Zero‑ohm adjustment for resistance tests
• Batteries from 1.5 V to 9 V
• 15‑position rotary dial with color‑coded scales
• Includes test leads and a concise instruction manual

Real‑world uses

Common tasks include checking household batteries for charge levels, diagnosing low voltage circuits, testing wall outlets for proper voltage and grounding, and assessing power cords, holiday lights, fuses, and switches to identify potential issues before replacement. The dual voltage testing capability makes it suitable for quick troubleshooting and routine maintenance in homes or small workshops.

Design and safety features

The GMT‑318 includes fuse overload protection to help keep users safe during measurements. A mirror scale helps minimize reading errors, and the built‑in Zero Ohms dial simplifies resistance testing. It is housed for indoor use and ships with approved test leads and a tri‑lingual manual for straightforward operation.

In the box and specs

Power comes from a single 1.5 V AA non‑rechargeable battery. The unit measures approximately 109 mm × 70 mm × 33 mm and weighs about 140 g with the battery. It’s designed for reliability in everyday environments and is supplied with test leads, a clear manual, and a 1‑year warranty.

Why choose GMT‑318

If you need a versatile, easy‑to‑read analog meter for quick diagnostics, the GMT‑318 offers a balanced mix of essential measurements, portability, and safety features without relying on digital screens. It’s a practical option for routine electrical checks and hobbyist projects, presenting possibilities for accurate readings and informed decisions rather than guarantees.