SKU: 7647014369

Electronic Specialties 684 400 Amp DC/AC Auto-Ranging Clamp Meter

$109.26 $121.40
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Description

Electronic Specialties 684 400 Amp DC/AC Auto-Ranging Clamp Meter684 is an all purpose clamp meter capable of measuring up to 400 amps inductively and safely. 400 amps will allow testing of electrical systems and alternator outputs, blower motors, electric motors and more. Plus, you have a full digital multi meter built in. Hard to access fuel pumps and compressor clutches can be measured too, via one of the Fuse Buddy Current Loops, model 307 or 308. While 684 can measure as high as 400 Amps, it's low reading

684 is an all purpose clamp meter capable of measuring up to 400 amps inductively and safely. 400 amps will allow testing of electrical systems and alternator outputs, blower motors, electric motors and more. Plus, you have a full digital multi-meter built-in. Hard to access fuel pumps and compressor clutches can be measured too, via one of the Fuse Buddy Current Loops, model 307 or 308. While 684 can measure as high as 400 Amps, it's low reading resolution is 10 milliamps. Please note, if you're main reason for buying a clamp meter is battery drains, we recommend our 687 or 688, both of which have 1 milliamp resolution.

Features

  • Clamp meter capable of measuring up to 400 amps DC/AC inductively and safely

  • Built in auto-ranging digital multimeter measures: DC/AC Volts, Ohms, Continuity, Frequency, Duty Cycle, Capacitance & Diode Test

  • CATIII 600V safety rating, 4000 count LCD, Backlit LCD display

  • Includes zippered storage case

  • Wide range of measurement from 10 milliamps up to 400 Amps max

Specifications

Manufacturer : Electronic Specialties

Brand : Electronic Specialties

Item Weight : 2 pounds

Product Dimensions : 9 x 4.5 x 2.5 inches

Item model number : 684

Batteries : 2 AAA batteries required. (included)

Manufacturer Part Number : 684

Cover Included : Clamp meter and test leads

ASIN : B078X1MYHB

Best Sellers Rank : #1,296,046 in Automotive (See Top 100 in Automotive) #6,432 in Diagnostic, Test & Measurement Tools

Date First Available : January 10, 2018

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SKU: 7647014369

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John T
Massapequa, US
★★★★★ 5
The best on the subject since LDD3
Format: Paperback
I found this book as impacting me as LDD (by Rubini etc) has been in its days, a de-facto standard established to the point that people keep searching for LDD4/LDD5 to these days, that much desirable. Since LDD3 the last update on 2.6, this book (as well as kernel debugging and hands-on systems programming) is a valuable source of information for modern kernels 5 and 6 for a few years to come. Knowledgeable and easy to follow, captivating attention to keep on reading it through, impressive for a technical book. LDD4+ has now found reincarnated, thank you very much for all the effort composing it!
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Reviewed in the United States on April 11, 2024
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Verified Purchase
Nick
Phoenix, US
★★★★★ 5
Compelling, informative, and accurate
Format: Kindle
I really could not be happier with the pace and level of detail this book provides. I am a very surface-level Linux user and I wanted to dive in head first. I often find that when I learn about something that I consider really hard or intimidating in tech, I get better at day-to-day use of the tools and my confidence grows. This book is a real confidence-booster if you crave the knowledge of how things work under the hood.
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Reviewed in the United States on October 8, 2024
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Wenhui Zhang
Omaha, US
★★★★★ 5
Great book to read
Format: Paperback, Format: Paperback
Great book to keep you updated about upstream Linux
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Reviewed in the United States on March 18, 2024
D
Dieter
Charlottesville, US
★★★★★ 5
A Hands-On and Deep Guide to Linux Kernel Programming
Format: Paperback
Linux Kernel Programming, Second Edition is a very practical and well-structured book for anyone who wants to understand how the Linux kernel works. It focuses on both theory and real hands-on learning. The book uses a clear style and explains complex topics in a simple way. It is designed to help readers build real skills, not just read concepts. It is especially useful for developers who want to work closer to the operating system. One of the most interesting parts of the book is the strong introduction to kernel programming. It explains how to set up a development environment, build the Linux kernel from source, and write the first kernel module. This section gives readers a solid starting point and builds confidence early in the learning process. It also explains why loadable kernel modules are widely used in real-world projects. Another highlight is the deep coverage of kernel internals. The book explains core concepts such as kernel architecture, processes, threads, and the difference between user mode and kernel mode. These ideas are often hard to understand, but the book presents them in a clear and structured way. This helps readers see how the operating system really works under the surface. The memory management section is especially strong and detailed. The book spends several chapters explaining how memory is allocated and managed inside the kernel. It also explains advanced topics such as page allocation, memory reclaim, and the out-of-memory system. These chapters are very useful for understanding performance and stability in real systems. Another very interesting section is the coverage of CPU scheduling. The book explains how the Linux kernel decides which task runs at a given time. It introduces scheduling policies, priorities, and modern features like control groups. The explanations are practical and supported by examples, which makes the topic easier to follow. The chapters on kernel synchronization are also a major highlight. They explain concepts such as locks, atomic operations, and deadlock prevention. These topics are critical for writing safe and reliable kernel code. The book also shows real examples and common mistakes, which helps readers avoid problems in their own work. Another strength of the book is its hands-on approach. It includes many kernel modules, scripts, and examples that readers can try themselves. This makes learning more engaging and helps turn theory into real skills. The focus on practical work makes the book stand out from more theoretical resources. Overall, this book is a great choice for developers, system programmers, and engineers who want to understand the Linux kernel in depth. It starts with the basics and moves into advanced topics in a smooth way. The combination of clear explanations and practical examples makes it a strong and valuable learning resource.
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Reviewed in the United States on April 16, 2026
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Ember
Bozeman, US
★★★★★ 4
Poor quality binding
Format: Paperback, Format: Paperback
Binding glue fell apart in less than a week and the pages fell out. Content is great though and I have a shiny new kernel based on Kali. 4 stars despite the binding because the content is top tier if you love all things Linux 🤌
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Reviewed in the United States on July 4, 2025

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