Search  for anything...
KZYEE

KM50 Power Circuit Probe & Automotive Circuit Tester with Live Waveform

  • Based on 3,864 reviews
Condition: New
Checking for the best price...
$159.99 Why this price?

Buy Now, Pay Later

As low as $26.67 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Thursday, Sep 17
Order within 18 hours and 10 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Color: Orange


Features

  • Go Beyond Basic Circuit TestingUpdated from the KZYEE KM10, the KM50 combines a 12V/24V automotive power circuit probe and automotive circuit tester with 7 dedicated test modes for deeper circuit and signal diagnosis. Along with voltage, continuity, polarity, short-circuit tracking and open-circuit identification, it adds dedicated frequency, duty cycle and fuel injection analysis for serious DIYers and independent technicians who need more than basic electrical checks
  • Dedicated Signal AnalysisThe KM50 switches between digital readings and live waveform display in AC voltage, frequency, duty cycle and fuel injection modes, showing how electrical signals change over time. Dedicated signal modes help identify changing readings, unstable signals and abnormal circuit behavior that basic voltage checks alone may not fully explain
  • Fuel Injection Circuit DiagnosisThe dedicated Fuel Inject mode displays injection time, injector supply voltage, reverse induced voltage, ground voltage and the control waveform in real time. When checking suspected injector-control problems, KM50 provides clearer electrical data to help determine whether further injector or wiring diagnosis is needed
  • Find and Verify Electrical FaultsUse the KM50 as a short circuit finder to track down shorts, identify open circuits, and check bad grounds, continuity and polarity. Then use component activation to apply power or ground to lights and compatible electrical components directly from the probe tip, helping narrow down whether further circuit or component diagnosis is needed before replacing parts
  • Focused Diagnostics Made SimpleThe included extension cable and long power cable provide added reach for different testing needs on 12V/24V vehicle electrical systems. Red/green LEDs, independently controlled lighting and buzzer feedback, a TFT color display and built-in overload protection make everyday electrical testing easier to follow for serious DIYers and independent technicians

Brand: KZYEE


Power Source: Vehicle 12v Battery Power Supply Or Ci-garette Lighter Power Supply; 24/7 Assistance Via Support@kzyeetech. Com See more


Style: KM50 Automotive circuit tester reveals hidden problems others miss! 7 Advanced Test Modes (DC/AC Voltage, Resistance, Diode, Frequency, Duty Cycle, Fuel Injection) – Quickly identify faulty circuits while eliminating good ones, cutting diagnostic time by 80%! See more


Color: Orange


Item Weight: 0.48 kg


Power Source: Vehicle 12v Battery Power Supply Or Ci-garette Lighter Power Supply; 24/7 Assistance Via Support@kzyeetech. Com


Minimum Operating Voltage: 8 volts


Upper Temperature Rating: 60 °C


Measurement Type: Multimeter


Maximum Operating Voltage: 30 volts


Compatible Devices: Vehicles with 12V or 24V electrical systems and a cigarette lighter port


Direct Current Maximum: 8 A


Style Name: KM50 Automotive circuit tester reveals hidden problems others miss! 7 Advanced Test Modes (DC/AC Voltage, Resistance, Diode, Frequency, Duty Cycle, Fuel Injection) – Quickly identify faulty circuits while eliminating good ones, cutting diagnostic time by 80%!


Color: Orange


Item Weight: 0.48 kg


Brand Name: KZYEE


Model: KZYEE-KM50


Unit Count: 1 Count


Number of Items: 1


Item Highlight: 12V/24V Short Circuit Finder, Open Circuit Detection, AC/DC Voltage, Resistance, Frequency, Duty Cycle, Component Activation


Manufacturer: KZYEE


Number of Packs: 1


Part Number: km50


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Sep 17

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Worth the money
Size: KM10
Worth the money and operates as expected. The slight delay in the changing of operations helps with the accidental depression of the test button.
Reviewed in the United States on June 12, 2025 by Amazon Customer
    • So Easy
Size: KM50
World great the easy way to test wires voltage amps ground with out switching the reading, one and done
Reviewed in the United States on June 5, 2025 by Laura J. Hogencamp
    • Good
Size: KM10
Very useful.
Reviewed in the United States on June 15, 2025 by David Hartranft
    • pretty good
Size: KM50
i dont like the fact that no attachments were provided to get inside fuse box pins for relay testing etc. - the tip on this is too thick for a lot of the work this is meant for, like backprobing connectors - you can kind of jerry-rig needle multimeter attachments on top of it but its not great
Reviewed in the United States on November 8, 2024 by max
    • Lo recomiendo
Size: KM10
Excelente
Reviewed in the United States on May 17, 2025 by Yunaisy Charles
    • It works if you're careful
Size: KM10
I had used it for about a year, no major issues. My only issue with the design is the length of the grounding cable, just a bit short for what I usually need it for, but I've been able to make it work with an extra wire. The only real problem I came across was when I had made the mistake of trying to apply power or ground to a wire when it had the other already active. User error, really. But it was when I kept doing it when I had to apply one of the two before making contact, like in a tight space. It would normally shut down and restart if you made a mistake, like normal. But I had done it quite a few times in a row and it had shut down completely. Few days later, it starting working again, but sometimes when you power it, it doesn't show or do anything on the screen but a blank background. Again, user error caused it. But other than that, having it as a mobile mechanic has saved me so much time, being able to see what is actually happening. I only have the KM10, but I honestly might upgrade to see what I can use the nicer model for. It was well worth the price. ... show more
Reviewed in the United States on June 30, 2023 by Michael Burr
    • well made
Size: KM10
works great
Reviewed in the United States on February 18, 2025 by Gary
    • Broken right out of box, then started working next time
Size: KM10
Screen lights up but is always blank, either circuits bad or screen it, but it's doa right out of the box, literally the first time I used it, the same day it arrived. Should not have bought a cheap clone. Next day, I was going to use the non digital parts to chase down my issue, and it started working and I liked it. Since that one was flaky, I got another to try, seems to work, bumping 3 to 3 stars, will update next time I use it, but it's pretty infrequent, that I chase the kind of electrical issue that needs more than just a test light so it might be a while. They did refund the price with no complaints, so that's good. Liked customer service If it seems reliable I'll update the review later. ... show more
Reviewed in the United States on May 19, 2024 by Eric W. Brown

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...