---
product_id: 25900828
title: "TOA ZM-104A Impedance Meter, Measures Impedance of Speaker Lines Up to 100k Ohms, Zero Adjustment for Accuracy On All Ranges, Easy to Read Meter Calibrates Directly in Ohms"
brand: "toa"
price: "VT127746"
currency: VUV
in_stock: true
reviews_count: 8
category: "Toa"
url: https://www.desertcart.vu/products/25900828-toa-zm-104a-impedance-meter-measures-impedance-of-speaker-lines
store_origin: VU
region: Vanuatu
---

# Direct ohm calibration Measures up to 100kΩ Zero adjustment for precision TOA ZM-104A Impedance Meter, Measures Impedance of Speaker Lines Up to 100k Ohms, Zero Adjustment for Accuracy On All Ranges, Easy to Read Meter Calibrates Directly in Ohms

**Brand:** toa
**Price:** VT127746
**Availability:** ✅ In Stock

## Summary

> 🎧 Tune into precision — don’t let your sound system settle for less!

## Quick Answers

- **What is this?** TOA ZM-104A Impedance Meter, Measures Impedance of Speaker Lines Up to 100k Ohms, Zero Adjustment for Accuracy On All Ranges, Easy to Read Meter Calibrates Directly in Ohms by toa
- **How much does it cost?** VT127746 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/25900828-toa-zm-104a-impedance-meter-measures-impedance-of-speaker-lines)

## Best For

- toa enthusiasts

## Why This Product

- Trusted toa brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **All-in-One Pro Kit:** Comes complete with test leads, carrying case, and an impedance-to-power conversion chart—ready for any job on the go.
- • **Built to Last, Built for Pros:** Trusted by audio service veterans for over 30 years, with repairable design and rugged ABS resin finish.
- • **Precision that Speaks Volumes:** Zero adjustment ensures pinpoint accuracy across all ranges, so your audio setups are flawless every time.
- • **Powerful Range, Professional Grade:** Measures impedance up to 100,000 ohms, covering all your speaker line needs with ease.
- • **Instant Clarity with Direct Readings:** Easy-to-read meter calibrated directly in ohms eliminates guesswork and speeds up diagnostics.

## Overview

The TOA ZM-104A Impedance Meter is a professional-grade tool designed to measure speaker line impedance up to 100k ohms with ±10% accuracy. Featuring zero adjustment for enhanced precision and a direct-reading meter calibrated in ohms, it simplifies audio diagnostics. This durable, battery-powered device includes test leads, a carrying case, and an impedance-to-power conversion chart, making it an essential instrument for sound engineers and audio professionals.

## Description

TOA ZM-104A Impedance Meter, Measures Impedance of Speaker Lines Up to 100k Ohms, Zero Adjustment for Accuracy On All Ranges, Easy to Read Meter Calibrates Directly in OhmsThe ZM-104A Impedance Meter can measure the impedance of speaker lines easily in the same manner as a circuit tester measures resistance.Key FeaturesImpedance-to-Power Conversion ChartMeasures Impedance of Speaker Lines Up to 100k OhmsZero Adjustment for Accuracy On All RangesEasy to Read Meter Calibrates Directly in OhmsIncludes carrying case, test leads and impedance to power reference chartSpecificationsPower Source: R6 x 4 (1.5 V DC x 4)Current Consumption: 39 mAReading: Direct reading meter, unit: ΩMeasurement Range: x1 range: 5 Ω - 1 kΩ, x10 range: 50 Ω - 10 kΩ, x100 range: 500 Ω - 100 kΩAccuracy: ±10 %Oscillation Frequency: 1 kHz, ±10 %Battery Life When Continuously Used: x1 range: 30 h, x10 range and x100 range: 60 hOperating Temperature: -5°C to +40°C (23°F to 104°)Dimensions: 120 x 220 x 63 mm (4.72" x 8.66" x 2.48") (carrying case)/110 x 180 x 58 mm (4.33" x 7.09" x 2.28") (unit only)Finish: ABS resin, blackWeight; 700 g (1.54 lb) (including carring case, without batteries)Accessory: 1 Set Test leadsMeasurement Category: CAT I

Review: A longtime high quality meter - My opinion as an audio service professional for 30+ years with a major national company, this is the best impedance meter ever made. Simple to use with accurate results. And totally repairable by TOA if you happen break it. If you’re gonna buy an Impedance Meter spend a few extra dollars and buy this one. The only little complaint I do have, plastic the “hinge” wears out on the front cover. Mine has small metal hinges riveted in place now, but you can easily buy a new case if your desire.
Review: Five Stars - I install commercial sound systems for a living, and this is a tool I can't live without.

## Features

- Impedance-to-Power Conversion Chart
- Measures Impedance of Speaker Lines Up to 100k Ohms
- Zero Adjustment for Accuracy On All Ranges
- Easy to Read Meter Calibrates Directly in Ohms
- Includes carrying case, test leads and impedance to power reference chart

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004KO1AS8 |
| Best Sellers Rank | #148,685 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #65 in Sound & Noise Meters |
| Brand | TOA |
| Brand Name | TOA |
| Color | Black |
| Customer Reviews | 4.0 out of 5 stars 19 Reviews |
| Item Dimensions | 10 x 6 x 3 inches |
| Item Weight | 700 Grams |
| Item dimensions L x W x H | 10 x 6 x 3 inches |
| Lower Temperature Rating | 23 Degrees Celsius |
| Manufacturer | TOA Electronics |
| Measurement Type | Ohmmeter |
| Minimum Operating Voltage | 6 Volts |
| Model | ZM-104A |
| Power Source | Battery Powered |
| Specification Met | Cat I |
| Style | Modern |
| Style Name | Modern |
| Unit Count | 1.0 Count |
| Upper Temperature Rating | 104 Degrees Fahrenheit |

## Product Details

- **Brand:** TOA
- **Color:** Black
- **Item Weight:** 700 Grams
- **Power Source:** Battery Powered
- **Style:** Modern

## Images

![TOA ZM-104A Impedance Meter, Measures Impedance of Speaker Lines Up to 100k Ohms, Zero Adjustment for Accuracy On All Ranges, Easy to Read Meter Calibrates Directly in Ohms - Image 1](https://m.media-amazon.com/images/I/61pVWBAQjkL.jpg)

## Questions & Answers

**Q: The readings I getting don’t make sense I am testin a Bogen SPT 15A I get a reading of 8 ohms at 10x divided by 4900 is 64 what am I doing wrong**
A: That horn has a selector to choose wattages via 25v/70v, or if you have the spt-158a is 8 ohms.
So do you have a 70voly system or 8 ohms

## Customer Reviews

### ⭐⭐⭐⭐⭐ A longtime high quality meter
*by K***H on December 2, 2025*

My opinion as an audio service professional for 30+ years with a major national company, this is the best impedance meter ever made. Simple to use with accurate results. And totally repairable by TOA if you happen break it. If you’re gonna buy an Impedance Meter spend a few extra dollars and buy this one. The only little complaint I do have, plastic the “hinge” wears out on the front cover. Mine has small metal hinges riveted in place now, but you can easily buy a new case if your desire.

### ⭐⭐⭐⭐⭐ Five Stars
*by R***G on April 30, 2016*

I install commercial sound systems for a living, and this is a tool I can't live without.

### ⭐ DOA, will return for refund
*by E***I on October 21, 2025*

Arrived DOA. Packaging was in good shape but meter not work. Will be returning for a refund.

## Frequently Bought Together

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-05-12*