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expiredjkilez posted Dec 25, 2022 03:14 PM
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expiredjkilez posted Dec 25, 2022 03:14 PM

Klein Tools MM400 600V Auto-Ranging Digital Multimeter

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$35

$82

57% off
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Deal Details
Home Depot has Klein Tools MM400 600V Auto-Ranging Digital Multimeter on sale for $34.97. Shipping is free.

Thanks to community member jkilez for finding this deal.

Product Details:
  • Multimeter measures up to 600V AC/DC voltage, 10A DC current, 2 MOhms resistance, continuity, batteries, and diodes
  • Lead Alert protection with LED's for test lead placement
  • Easy-to-view backlit display for low light environments
  • Low battery indicator and easily accessible battery and fuse compartment
  • Durable meter built to withstand a 6.6-Foot (2 m) drop
  • Includes test leads, batteries and user manual
  • CAT III 600V safety rating
  • For use in basic and controlled electromagnetic environments such as residential, business and light-industrial locations

Editor's Notes

Written by oceanlake | Staff
  • About this deal:
    • This price matches a previous Frontpage Deal that received over +150 thumbs up from our community.
    • See the forum thread for additional discussion of this deal.
  • About this product:
    • This multimeter has received an average rating of 4.7 stars out of 5 based on over 3,200 Amazon customer reviews.
  • About this store:
    • Amazon offers free returns for this item. You can return the item for any reason in new and unused condition: no shipping charges.
    • Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
    • If you're not a student, there's also a free 1-Month Amazon Prime trial available.
No Longer Available:
Amazon has Klein Tools MM400 600V Auto-Ranging Digital Multimeter on sale for $34.97. Shipping is free.

Original Post

Written by jkilez
Product Info
Community Notes
About the Poster
Deal Details
Product Info
Community Notes
About the Poster
Home Depot has Klein Tools MM400 600V Auto-Ranging Digital Multimeter on sale for $34.97. Shipping is free.

Thanks to community member jkilez for finding this deal.

Product Details:
  • Multimeter measures up to 600V AC/DC voltage, 10A DC current, 2 MOhms resistance, continuity, batteries, and diodes
  • Lead Alert protection with LED's for test lead placement
  • Easy-to-view backlit display for low light environments
  • Low battery indicator and easily accessible battery and fuse compartment
  • Durable meter built to withstand a 6.6-Foot (2 m) drop
  • Includes test leads, batteries and user manual
  • CAT III 600V safety rating
  • For use in basic and controlled electromagnetic environments such as residential, business and light-industrial locations

Editor's Notes

Written by oceanlake | Staff
  • About this deal:
    • This price matches a previous Frontpage Deal that received over +150 thumbs up from our community.
    • See the forum thread for additional discussion of this deal.
  • About this product:
    • This multimeter has received an average rating of 4.7 stars out of 5 based on over 3,200 Amazon customer reviews.
  • About this store:
    • Amazon offers free returns for this item. You can return the item for any reason in new and unused condition: no shipping charges.
    • Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
    • If you're not a student, there's also a free 1-Month Amazon Prime trial available.
No Longer Available:
Amazon has Klein Tools MM400 600V Auto-Ranging Digital Multimeter on sale for $34.97. Shipping is free.

Original Post

Written by jkilez

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Top Comments

kevinaaa
3471 Posts
525 Reputation
Clamp meter cannot test low current in milliamps which is very common in computer electronics.
starfoxinstinct
3308 Posts
833 Reputation
Googled it and TRMS seems to be useful for measuring modern AC current waveforms, so if you work with AC voltage you probably need that.

Edit: some smarter people corrected me downthread and basically you won't need this unless you really need accurate AC voltage readouts, which you don't most of the time.
Jedi2155
598 Posts
80 Reputation
To give you some ideas of where TrueRMS is necessary is when the AC output becomes non-sinusoidal.

In laymans terms, non-inverter and things that aren't "true sinewave" outputs. These include:

Generators without an inverter output
Battery generators that you're pushing beyond its rated power (the waveform tends to stop being sinusoidal after its max range)
Bad power quality / poor wiring situations
Output a battery based ac inverter that isn't a "true sine" such as the stuff that connects to your car battery, UPS, etc.

There are many situations where a TrueRMS output is useful for the everyday layman but many laymans and professionals don't know when those occur.

I have a background in power electronics, power quality, and was a utility engineer.

68 Comments

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Dec 25, 2022 03:33 PM
9,203 Posts
Joined Aug 2018
Dec 25, 2022 03:33 PM
TodayOnlyDec 25, 2022 03:33 PM
9,203 Posts
does this one have that much-needed RMS
3
Original Poster
Dec 25, 2022 03:43 PM
2,005 Posts
Joined Nov 2012
Dec 25, 2022 03:43 PM
jkilez
Original Poster
Dec 25, 2022 03:43 PM
2,005 Posts
Quote from TodayOnly :
does this one have that much-needed RMS
No TrueRMS on this model. For that you would need at least the MM420 which usually sells for about $60.
1
Dec 25, 2022 08:32 PM
3,471 Posts
Joined Jan 2015
Dec 25, 2022 08:32 PM
kevinaaaDec 25, 2022 08:32 PM
3,471 Posts
There was an additional 10% clip coupon yesterday
Pro
Dec 25, 2022 08:33 PM
402 Posts
Joined May 2018
Dec 25, 2022 08:33 PM
tmitim1983
Pro
Dec 25, 2022 08:33 PM
402 Posts
What is that TrueRMS, and why do we need it? And I never understand, why not just but a clamp meter that can test both amperage and voltage? What does this have in advantage?
2
Dec 25, 2022 08:41 PM
613 Posts
Joined Sep 2017
Dec 25, 2022 08:41 PM
NojisticDec 25, 2022 08:41 PM
613 Posts
Too much for basic home electric stuff? New to DIY for electrical at home so open to recommendations. TIA
Dec 25, 2022 08:43 PM
12,436 Posts
Joined Jan 2007
Dec 25, 2022 08:43 PM
MadPupDec 25, 2022 08:43 PM
12,436 Posts
The MM600 is $18 at HD B&M if you can find one. It also comes with a case.

https://slickdeals.net/f/16275322
Last edited by MadPup December 25, 2022 at 12:45 PM.
1
Dec 25, 2022 08:43 PM
3,471 Posts
Joined Jan 2015
Dec 25, 2022 08:43 PM
kevinaaaDec 25, 2022 08:43 PM
3,471 Posts

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

Quote from tmitim1983 :
What is that TrueRMS, and why do we need it? And I never understand, why not just but a clamp meter that can test both amperage and voltage? What does this have in advantage?
Clamp meter cannot test low current in milliamps which is very common in computer electronics.
Last edited by kevinaaa December 25, 2022 at 01:16 PM.
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Dec 25, 2022 08:46 PM
3,471 Posts
Joined Jan 2015
Dec 25, 2022 08:46 PM
kevinaaaDec 25, 2022 08:46 PM
3,471 Posts
Quote from MadPup :
The MM600 is $18 at HD B&M if you can find one. It also comes with a case.

https://slickdeals.net/f/16275322
That's a big if
Dec 25, 2022 09:28 PM
141 Posts
Joined Jan 2009
Dec 25, 2022 09:28 PM
CalamityJoeDec 25, 2022 09:28 PM
141 Posts
Bought this a few weeks back and the one I received was refurbished. Sent it back.
1
Dec 25, 2022 09:31 PM
2,347 Posts
Joined May 2007
Dec 25, 2022 09:31 PM
eeagleDec 25, 2022 09:31 PM
2,347 Posts
Quote from Nojistic :
Too much for basic home electric stuff? New to DIY for electrical at home so open to recommendations. TIA
KAIWEETS Digital Multimeter TRMS 6000https://www.amazon.com/dp/B07SHLS...ct_details clip the coupon for $20
2
Dec 25, 2022 09:38 PM
890 Posts
Joined Feb 2018
Dec 25, 2022 09:38 PM
ThriftyHalibut921Dec 25, 2022 09:38 PM
890 Posts
Quote from eeagle :
KAIWEETS Digital Multimeter TRMS 6000https://www.amazon.com/dp/B07SHLS...ct_details clip the coupon for $20
I got that a couple weeks ago, not bad for $19.32
1
Dec 25, 2022 10:15 PM
50 Posts
Joined Jun 2022
Dec 25, 2022 10:15 PM
Jchavezjr92Dec 25, 2022 10:15 PM
50 Posts
This good for checking basic voltage?
Dec 25, 2022 10:22 PM
3,308 Posts
Joined May 2004
Dec 25, 2022 10:22 PM
starfoxinstinctDec 25, 2022 10:22 PM
3,308 Posts

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

Quote from tmitim1983 :
What is that TrueRMS, and why do we need it? And I never understand, why not just but a clamp meter that can test both amperage and voltage? What does this have in advantage?
Googled it and TRMS seems to be useful for measuring modern AC current waveforms, so if you work with AC voltage you probably need that.

Edit: some smarter people corrected me downthread and basically you won't need this unless you really need accurate AC voltage readouts, which you don't most of the time.
Last edited by starfoxinstinct December 25, 2022 at 04:46 PM.
3
1
Original Poster
Dec 25, 2022 10:28 PM
2,005 Posts
Joined Nov 2012
Dec 25, 2022 10:28 PM
jkilez
Original Poster
Dec 25, 2022 10:28 PM
2,005 Posts
Quote from Nojistic :
Too much for basic home electric stuff? New to DIY for electrical at home so open to recommendations. TIA
Quote from Jchavezjr92 :
This good for checking basic voltage?
This (or the slightly cheaper MM300) is probably the cheapest "name brand" multimeter you will find. What you get over a $7 Harbor Freight meter is confidence in its accuracy. If all you need a meter for is to check hot-or-not, then the HF one is probably all you need.
1

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Dec 25, 2022 10:29 PM
50 Posts
Joined Jun 2022
Dec 25, 2022 10:29 PM
Jchavezjr92Dec 25, 2022 10:29 PM
50 Posts
Quote from jkilez :
This (or the slightly cheaper MM300) is probably the cheapest "name brand" multimeter you will find. What you get over a $7 Harbor Freight meter is confidence in its accuracy. If all you need a meter for is to check hot-or-not, then the HF one is probably all you need.
Thanks i just want make sure appreciate it
1

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