---
product_id: 3045404
title: "CM100"
brand: "gtc"
price: "5959 Ft"
currency: HUF
in_stock: false
reviews_count: 13
url: https://www.desertcart.hu/products/3045404-cm100
store_origin: HU
region: Hungary
---

# 0.001–100 A AC/DC range Compact 1.2" jaw size 2 readings/sec sampling CM100

**Brand:** gtc
**Price:** 5959 Ft
**Availability:** ❌ Out of Stock

## Summary

> ⚡ Clamp the Current, Own the Circuit!

## Quick Answers

- **What is this?** CM100 by gtc
- **How much does it cost?** 5959 Ft with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/products/3045404-cm100)

## Best For

- gtc enthusiasts

## Why This Product

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

## Key Features

- • **Ready-to-Go Kit:** Includes test leads, deluxe soft pouch, and batteries—work smarter from the start.
- • **Smart Data Capture:** Peak and data hold functions with intuitive rotary switch for fast, reliable readings.
- • **Compact Power Clamp:** Small jaw design fits tight spaces—perfect for automotive and electrical pros.
- • **Dual Voltage & Resistance:** Handles AC/DC voltage up to 600 V plus resistance checks with ease.
- • **Precision Current Mastery:** Measures ultra-low 1 mA to high 100 A currents for flawless diagnostics.

## Overview

The GTC CM100 is a versatile low current clamp meter designed for precise AC/DC current measurement from 0.001 to 100 amps, with voltage testing up to 600 volts. Its compact jaw size allows access to tight spaces, making it ideal for automotive diagnostics and electrical troubleshooting. Featuring peak and data hold functions, fast sampling at 2 readings per second, and continuity checks with audible alerts, it comes complete with test leads, a deluxe carrying pouch, and batteries for immediate use.

## Description

Quickly and easily measures circuit current consumption, as well as voltages and resistances.

Review: Works well, very accurate - Great milliamp meter for DIYing a vehicles electrical system/battery drain. Measurements are consistent and accurate. Easy to use. Money well spent!
Review: Perfect for Hunting Automotive Ignition Off Parasitic Battery Drains - I give it 5 Stars because of the purpose it serves for the price one pays. DC clamp meters are not usually low cost and if they are they are usually less than stellar. This meter is perfect for chasing after automotive ignition off parasitic battery drains, AKA Dark Current". The small form factor helps for getting into tight places. There are other reviews here about the characteristics of this meter such as its sensitivity to ambivalent temps. I find if I'm working under a hot hood, as the meter warms up if held under there long, just re-zero it every once and a while and clamp again. If I am going to check current on a given cable I will hold it beside the point where I am going to clamp and zero it first. Especially if near a battery or other live wires or junctions so any magnetic fields can be taken into the factor. Its easy enough to just press a button twice. There is a very detailed Utube review by Pretty Boy 0508.

## Features

- AC/DC current measurement from 0.001 up to 100 A. which makes it a great tool for measuring parasitic draws and AC/DC voltage measurement up to 600 volt
- Small jaw: 1.2 inches (W) x 0.53 inches (D) (300x13.4millimeters) with clamp opening up to 1/2 inch (12.5 millimeters)
- Peak and Data hold functions with one rotary switch operation
- 2 readings per second sampling and continuity check with audible indicator
- Test leads soft carrying deluxe pouch and batteries included

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001TCWL1E |
| Best Sellers Rank | #281,156 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #178 in Clamp Meters |
| Brand | GTC |
| Color | Grey with Yellow Clamp |
| Customer Reviews | 4.4 4.4 out of 5 stars (302) |
| Date First Available | April 21, 2011 |
| Global Trade Identification Number | 00833303000282 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 15.2 ounces |
| Item dimensions L x W x H | 11.4 x 5.7 x 2.5 inches |
| Item model number | CM100 |
| Manufacturer | General Technologies Corp. |
| Manufacturer Part Number | CM100 |
| Measurement Type | Ammeter |
| Model | CM100 |
| Power Source | Battery Powered |
| Product Dimensions | 11.4 x 5.7 x 2.5 inches |
| Specification Met | Gtc |
| Style | Modern |
| UPC | 833303000282 |

## Product Details

- **Brand:** GTC
- **Color:** Grey with Yellow Clamp
- **Item Weight:** 15.2 ounces
- **Power Source:** Battery Powered
- **Style:** Modern

## Images

![CM100 - Image 1](https://m.media-amazon.com/images/I/71Umca8gORL.jpg)
![CM100 - Image 2](https://m.media-amazon.com/images/I/71yuYsG+NML.jpg)
![CM100 - Image 3](https://m.media-amazon.com/images/I/61e--cCHdLL.jpg)
![CM100 - Image 4](https://m.media-amazon.com/images/I/61bIaEftPSL.jpg)

## Questions & Answers

**Q: The stated accuracy for DC current is, " +/- 2.5% +/- 10 dgts."   (Assume "dgts" = digits?)   Can anyone clearly explain what "+/- 10 digits" means?**
A: The +/- 10 digits means that the meter may be off 10 digits in the least significant (furthest to the right of the decimal place) digit. It's a standard way that meters are rated for accuracy besides the +/- %. If the meter is reading to 3 significant digits (0.000 to +/- 9.999 then the meter may be "off" ten digits in the 0.00x place). This is in addition to the percent error. For example, if this meter reads "1.000" mA. The actual value may be +/- 2.5% (+/- 0.025 mA) +/- 10 digits, so that means the actual value would be between 1.000+/-.025+/-.010= 1.035 to 0.965. If the meter range was only 2 decimal places (it read 1.00) then the actual value would be 1.00+/-.025+/-0.10= 1.33 to 0.87. Think of "+/- digits" at the amount number of values the least significant digit in the reading may be "wrong". This must be added to the percentage error. Hope that makes sense.

**Q: Will the 100 amp max. range be enough to check the starter current drawn from the battery by cars & trucks ? Will the clamps fully grip the cables ?**
A: For starter motors, this is the wrong tool for the job. It is the best low current clamp meter I have used, closest measurement to a Siemens device I also use, and that's well over $3000.

This little guy fits in your pocket, and it's made in the USA.

It is temperature sensitive, so it does require zeroing occasionally, its only drawback. But, if you are measuring a few milliamps, it's very useful. 

For starter draw, I use the Fluke 88 with the i1010 clamp accessory. With this device, you can read average and peak draw.

**Q: For AC current measurements at the low end (20-100 mA), does this meter achieve the stated accuracy/precision (+/- 10 mA)?  Thanks.**
A: On AC current it is OK but on DC it is very unstable and you have to constantly pushing Reset because after measuring a current it does not returns to zero, it stays at there last measure.

**Q: Can this meter read in the 2 - 3 ma range in the ac mode?**
A: I never try that, for low frequency should be OK. For high frequency AC , should use scope.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works well, very accurate
*by G***R on July 5, 2024*

Great milliamp meter for DIYing a vehicles electrical system/battery drain. Measurements are consistent and accurate. Easy to use. Money well spent!

### ⭐⭐⭐⭐⭐ Perfect for Hunting Automotive Ignition Off Parasitic Battery Drains
*by G***I on August 17, 2014*

I give it 5 Stars because of the purpose it serves for the price one pays. DC clamp meters are not usually low cost and if they are they are usually less than stellar. This meter is perfect for chasing after automotive ignition off parasitic battery drains, AKA Dark Current". The small form factor helps for getting into tight places. There are other reviews here about the characteristics of this meter such as its sensitivity to ambivalent temps. I find if I'm working under a hot hood, as the meter warms up if held under there long, just re-zero it every once and a while and clamp again. If I am going to check current on a given cable I will hold it beside the point where I am going to clamp and zero it first. Especially if near a battery or other live wires or junctions so any magnetic fields can be taken into the factor. Its easy enough to just press a button twice. There is a very detailed Utube review by Pretty Boy 0508.

### ⭐⭐⭐⭐⭐ accurate and fast response time
*by M***E on January 12, 2012*

Very accurate down to 1ma level. When measuring the DC current combined with peak function, you need follow the current flow direction mark on the clamp side, if flow direction reversed, then you will always get "0" as peak value because the real peak value is recorded as negative,then you will think the peak funtion is not working.( this is also true for dc vlotage measuremet with test lead) Its response time is quick. The zero function work fast and accurate. Only one issue: the DC voltage measuremet get 0.2 volt difference (less) in negative reading if you reverse the two test leads to measre.(like 1.5 v and -1.3 v which shouel be -1.5 v) I tried two meters and they act the same. I may live with this and remember to keep the low DC voltage measurment in positive side. Amazon even send me the new second meter before I return the first one. Definitely a great buy, if you wnat measure low accurate dc or ac current with clamp, and need peak function.

## Frequently Bought Together

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*Product available on Desertcart Hungary*
*Store origin: HU*
*Last updated: 2026-03-11*