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phoinix | Staff 26.4K Views
Feb 13, 2025 9:46 AM

Klein Tools CL390 Digital Auto Ranging Clamp Meter (400A AC/DC)

$68

$133

48% off
+ Free Shippingat Amazon
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Deal Details
Amazon has Klein Tools CL390 Digital Auto Ranging Clamp Meter (400A AC/DC) on sale for $67.99. Shipping is free.

Thanks to Deal Hunter phoinix for posting this deal.

About this Product:
  • Measures AC/DC current and NCVT via clamp; AC/DC voltage, resistance, continuity, frequency/duty cycle, DC microamps, diode test and capacitance via test-leads; temperature via thermocouple
  • Integrated into the clamp jaw for convenient electrical testing
  • High-visibility reverse-contrast LCD ensures improved viewability in all lighting conditions
  • Auto-ranging and True Root Mean Squared (TRMS) technology provides precise and accurate measurements
  • Test lead holder on the side of the clamp and optional magnetic hanger (Cat. Nos. 69445 or 69417) for hands-free operation
  • Max/Min, Rel/Zero, Data Hold capability for enhanced functionality and auto-power off after 10 minutes to conserve battery life
  • Includes carrying case, test leads with CAT III/CAT IV safety caps, thermocouple, instructions, and 3 x AAA batteries

Editor's Notes

Written by SubZero5 | Staff
  • About this Deal:
  • About this Store:
  • Additional Notes:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by phoinix | Staff
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Amazon has Klein Tools CL390 Digital Auto Ranging Clamp Meter (400A AC/DC) on sale for $67.99. Shipping is free.

Thanks to Deal Hunter phoinix for posting this deal.

About this Product:
  • Measures AC/DC current and NCVT via clamp; AC/DC voltage, resistance, continuity, frequency/duty cycle, DC microamps, diode test and capacitance via test-leads; temperature via thermocouple
  • Integrated into the clamp jaw for convenient electrical testing
  • High-visibility reverse-contrast LCD ensures improved viewability in all lighting conditions
  • Auto-ranging and True Root Mean Squared (TRMS) technology provides precise and accurate measurements
  • Test lead holder on the side of the clamp and optional magnetic hanger (Cat. Nos. 69445 or 69417) for hands-free operation
  • Max/Min, Rel/Zero, Data Hold capability for enhanced functionality and auto-power off after 10 minutes to conserve battery life
  • Includes carrying case, test leads with CAT III/CAT IV safety caps, thermocouple, instructions, and 3 x AAA batteries

Editor's Notes

Written by SubZero5 | Staff
  • About this Deal:
  • About this Store:
  • Additional Notes:
    • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Written by phoinix | Staff

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28 Comments

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Feb 13, 2025 11:12 AM
8 Comments
Joined Dec 2024
HappyPlastic889Feb 13, 2025 11:12 AM
8 Comments
What is an auto ranging clamp meter??
4
Feb 13, 2025 2:10 PM
2.3K Comments
Joined Nov 2016
Tbl5143Feb 13, 2025 2:10 PM
2.3K Comments
Had a Klein clamping meter (looks exactly like this) that I bought in 2018. Worked fine when I got it,. Then didn't need it until like 2021, when my AC went out. The capacity test function just yielded random values all over the place (it worked in 2018 because that's what I bought it for in the first place). I even put a brand new battery in. Went and bought another multimeter (different brand) which worked just fine. Needless to say I threw my Klein into the trash after only 3-4 brief uses...
Last edited by Tbl5143 February 13, 2025 at 06:12 AM.
3
1
4
Feb 13, 2025 3:32 PM
43 Comments
Joined Dec 2024
immortal_tricycleFeb 13, 2025 3:32 PM
43 Comments

Our community has rated this post as helpful. If you agree, why not thank

Quote from HappyPlastic889 View quoted comment :
What is an auto ranging clamp meter??
Multimeters have classically required that you set the meter both to the property you want to measure and the range you expect the measurement to fall within. Selecting too low of a range for the application yields an overload reading, selecting too high of a range reduces the number of significant figures of the measurement. An auto-ranging multimeter switches ranges automatically to provide the most detailed measurement it can without overloading.
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Measuring current usually requires breaking the circuit under test and placing the multimeter into the circuit at the location you want to measure. Clamp meters can measure current without modifying the circuit, as long as you can get the clamp around a lead that you want to measure. Many clamp meters read only AC current this way; this meter can measure both AC and DC current via the clamp.
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I've had this model for a few years and it's been fine. I don't care for the inverted display, and the auto-off timeout is too short, but otherwise I can't complain.
8
Feb 13, 2025 10:48 PM
879 Comments
Joined Jan 2009
HkxyzFeb 13, 2025 10:48 PM
879 Comments
I need a dc current clamp meter, anything better in this price range?
Feb 13, 2025 11:39 PM
1.3K Comments
Joined Dec 2006
HexiumVIIFeb 13, 2025 11:39 PM
1.3K Comments
Quote from Hkxyz View quoted comment :
I need a dc current clamp meter, anything better in this price range?
Kaiweets seems to be the only one with cheap dc clamp. Im going to get one soon
Feb 13, 2025 11:47 PM
1.3K Comments
Joined Jul 2009
ViciousXUSMCFeb 13, 2025 11:47 PM
1.3K Comments
Quote from HexiumVII View quoted comment :
Kaiweets seems to be the only one with cheap dc clamp. Im going to get one soon
I have some stuff from them, I dont recall if it was the clamp or not, but it was a meter and it has done just as good as any other for home electrical needs.

Of course none of this stuff is scientific instruments so hopefully nobody demands 0.01mv accuracy.
Feb 14, 2025 12:14 AM
2.3K Comments
Joined Dec 2012
fiveohfourFeb 14, 2025 12:14 AM
2.3K Comments

Our community has rated this post as helpful. If you agree, why not thank

Quote from immortal_tricycle View quoted comment :
Multimeters have classically required that you set the meter both to the property you want to measure and the range you expect the measurement to fall within. Selecting too low of a range for the application yields an overload reading, selecting too high of a range reduces the number of significant figures of the measurement. An auto-ranging multimeter switches ranges automatically to provide the most detailed measurement it can without overloading.
-
Measuring current usually requires breaking the circuit under test and placing the multimeter into the circuit at the location you want to measure. Clamp meters can measure current without modifying the circuit, as long as you can get the clamp around a lead that you want to measure. Many clamp meters read only AC current this way; this meter can measure both AC and DC current via the clamp.
-
I've had this model for a few years and it's been fine. I don't care for the inverted display, and the auto-off timeout is too short, but otherwise I can't complain.
Just a heads up fwiw you can disable the auto-off timer on startup for situations that call for it
4

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Feb 14, 2025 12:31 AM
59 Comments
Joined Nov 2018
MKinFeb 14, 2025 12:31 AM
59 Comments
how is this comparing to Kaiweets KC604
https://www.amazon.com/gp/product/B0CVXCFMLY

KC604 is just half of the price with extra discount. Same features and good reviews. Wondering what makes Klein twice the price.
1
Feb 14, 2025 12:59 AM
154 Comments
Joined Mar 2020
hundredlivesFeb 14, 2025 12:59 AM
154 Comments
Keep in mind models like these are not great for low current applications like parasitic draw in the low ma for a car.
Feb 14, 2025 1:00 AM
2.3K Comments
Joined Dec 2012
fiveohfourFeb 14, 2025 1:00 AM
2.3K Comments
Quote from Hkxyz View quoted comment :
I need a dc current clamp meter, anything better in this price range?
Are you quite familiar with clamp meters or no? If not Let's start with your intended use case. What do you need to use it on, for etc and why/to what extent? Daily use? Parked in a drawer most of the time? What is the max voltage you'll be using it with and what current range do you need to be covered ? Are you sure you need a multimeter? For example does your use case benefit from a constant, current reading ? Because that's a possibility, you could rig up a little display that shows you real time current usage all the time, vs the meter which is more for single readings or troubleshooting etc and is filled with a bunch of features in the form of a full on multimeter that probes about a bakers dozen different types of readings in Addition to dc current.

Are you looking to use on applications with single or tens/hundreds of milliampere or fractions of a milliamp or between .5 amps and 10 amps? Dozens? Hundreds of amps?



TLDR A low and high end current range would be helpful as well as the use case for making suggestions. And if you're an electrical engineer that wanted nothing answered but the exact question you asked…we can just pretend this exchange never occurred. 😜
Feb 14, 2025 1:10 AM
348 Comments
Joined Jan 2006
nerdmanxdxFeb 14, 2025 1:10 AM
348 Comments
Dead? I'm seeing $100 now.
Feb 14, 2025 3:27 AM
879 Comments
Joined Jan 2009
HkxyzFeb 14, 2025 3:27 AM
879 Comments
Quote from fiveohfour View quoted comment :
Are you quite familiar with clamp meters or no? If not Let's start with your intended use case. What do you need to use it on, for etc and why/to what extent? Daily use? Parked in a drawer most of the time? What is the max voltage you'll be using it with and what current range do you need to be covered ? Are you sure you need a multimeter? For example does your use case benefit from a constant, current reading ? Because that's a possibility, you could rig up a little display that shows you real time current usage all the time, vs the meter which is more for single readings or troubleshooting etc and is filled with a bunch of features in the form of a full on multimeter that probes about a bakers dozen different types of readings in Addition to dc current.

Are you looking to use on applications with single or tens/hundreds of milliampere or fractions of a milliamp or between .5 amps and 10 amps? Dozens? Hundreds of amps?



TLDR A low and high end current range would be helpful as well as the use case for making suggestions. And if you're an electrical engineer that wanted nothing answered but the exact question you asked…we can just pretend this exchange never occurred. 😜
Just 12v stuff mostly, not daily use, redoing a trailer.
Feb 14, 2025 3:35 AM
203 Comments
Joined May 2012
sahivelyFeb 14, 2025 3:35 AM
203 Comments
Quote from Hkxyz View quoted comment :
I need a dc current clamp meter, anything better in this price range?
No, it's actually a decent deal.
Feb 14, 2025 4:51 AM
336 Comments
Joined May 2007
liedelFeb 14, 2025 4:51 AM
336 Comments
If you get this (which you should I have it and it's my go-to multimeter on projects, although I grab a smaller one for one-off readings) grab the AC power splitter thingy that lets you get a clamp off a live circuit without isolating the live wire (clamping the whole cable otherwise will cancel out your readings).

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Feb 14, 2025 5:44 AM
59 Comments
Joined Nov 2018
MKinFeb 14, 2025 5:44 AM
59 Comments
Quote from MKin View quoted comment :
how is this comparing to Kaiweets KC604https://www.amazon.com/gp/product/B0CVXCFMLYKC604 is just half of the price with extra discount. Same features and good reviews. Wondering what makes Klein twice the price.
don't just thumbs down. tell me why choosing Klein over Kaiweets pls.

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