Amprobe ACD-51NAV CAT IV 600 A TRMS Navigator Clamp Meter

(19 customer reviews)

  • True-rms technology improves accuracy in noisy environments
  • Measures AC/DC voltage to 1000 V, AC current to 600 A, plus resistance, frequency, capacitance, power factor, total harmonics distortion (THD) and individual harmonics from 1 to 25
  • Measures temperature from -58 °F to 1832 °F (-50 °C to 1000 °C)
  • Provides DC micro amps measurements to test flame sensors
  • Includes inrush current measurement and phase rotation indication for 3-phase motors
  • Non-contact voltage detection enhances safety
  • Low pass filter enables measuring voltage and frequency on variable frequency drives
  • Continuity beeper quickly identifies shorts and opens
  • Large backlit digital display with analog bar graph presents the full picture
  • Min, max and smart data hold
  • Peak hold identifies spikes and transients
  • In-jaw flashlight automatically lights when jaws open to illuminate dark panels and junction boxes
  • Auto power off conserves battery life
  • Maximum jaw opening accommodates large conductors up to 1.45″ (37 mm)
  • Rubber overmold body absorbs shocks—drop proof to 4 feet (1.2 m)
  • CAT IV-rated


SKU: 3729950 Category:


This versatile clamp-on power meter offers a full range of diagnostics, including those that HVAC technicians need most—volts, amps, resistance, capacitance, DC microamps, in-rush current and temperature.

A great clamp-on multimeter choice for troubleshooting or maintaining air conditioning or motor efficiency, measuring phase rotation, and identifying harmonics. Convenient joystick enables quick single-handed function selection.


AC Current 100.00 A, 600.0 A 100.00 A, 1000.0 A +/- (1.5 % rdg
+ 5 LSD)
DC Current _ _ 100.00 A, 600.0 A _ 100.00 A, 1000.0 A +/- (1.5 % rdg
+ 5 LSD)
AC Voltage 100.00 V, 1000 V +/- (1.0 % rdg
+ 5 LSD)
DC Voltage 100.00 V, 1000 V +/- (0.7 % rdg
+ 2 LSD)
Resistance 1.0000 KO, 10.00 KO, 100.00 KO +/- (1.0 % rdg
+ 3 LSD)
Frequency 20.0 Hz to 10 KHz +/- (0.5 % rdg
+3 LSD)
Capacitance 400.0 µF, 4.000 mF +/- (1.9 % rdg
+ 8 LSD)
DCµA _ 1000.0 µA _ _ _ +/- (1.7 % rdg
+ 2 LSD)
Temperature _ -50 °F → 1832 °F (-50 ºC → 1000 ºC) _ _ -50 °F → 1832 °F (-50 ºC → 1000 ºC) +/- (1 % rdg
+ 0.8 ºC)
THD (Total harmonics distortion) 0.1% → 100.0% +/- (3.0 % rdg
+ 10 LSD)
Individual harmonics 1 → 25 _
Power 10 kW → 600 kW 10 kW → 1000 kW +/- (2.5 % rdg
+ 5 LSD)
Power factor -1.00 → 1.00 +/- 3 degrees
Accommodates conductors Up to 1.45″ (37 mm) in diameter Up to 1.60″ (40 mm) in diameter



Navigator Clamp Meters

Take control with the ACD Navigator Clamp Meters.

What’s Included

  • ACD-51NAV
  • Test leads
  • Batteries (installed)
  • Carrying case
  • Banana k-type thermocouple


Datasheet »
Product Manual »

19 reviews for Amprobe ACD-51NAV CAT IV 600 A TRMS Navigator Clamp Meter

  1. Wirenut

    Excellant Tool for the Trades

    We have found this tool to be very accurate and reliable. It is ergonomic and has many uses in the filed for us. I would highly recommned this to all HVAC and Electrical Trades and Building Management users.

    ✔ Yes, I recommend this product.

  2. tools4me

    Great item.

    This item is a great quality item and has worked flawlessly

    ✔ Yes, I recommend this product.

  3. electricalpro79

    its a must have!

    amprobe makes excellent quality testers. As a master electrician and HVACR tech I use this meter in both fields. The reliablity and accuracy are great and the price is good as well. I highly reccomend!

    ✔ Yes, I recommend this product.

  4. jscrotty


    This new Amprobe is AWESOME its so precise being an old school guy i am, used to usuing a needle simpson meter this blows my mind this thing is awesome you cna do so do much and the clamp feature allows you to clamp on the big wires

    ✔ Yes, I recommend this product.

  5. rrrick

    I like the compact size and overall features

    I have gone through several meters this is one of the most rugged I have found and fits easily in my back pocket or my tool bag.

    ✔ Yes, I recommend this product.

  6. Raymond57

    Good Product

    Has all of fuctions that a that a Electriicans needs.
    I would recommond ACD-51NAV camp on meter.
    NIce having Temp sense feature

    ✔ Yes, I recommend this product.

  7. Alexfor64

    this product is fantastic.

    excelent, great product. I’ll recomend to any one,

    ✔ Yes, I recommend this product.

  8. gewen

    amprobe is easy and quick. no tme lost

    This amprobe has it all as far as I am concerned. The amprobe is quick and easy to read. One of the best features as far as I am concerned.

    ✔ Yes, I recommend this product.

  9. Brew

    A must have tool for all users

    The tool is smaal compact, but has all the features you need in one tool. I HAVE COMPARED IT WITH SOME OF MY HIGH END TOOLS AND WAS SURPRISED AT THE ACCURATE READINGS.

    ✔ Yes, I recommend this product.

  10. Moonshine

    Exceptional, versitile

    There is so much to say. This tool is a great size and made with the highest quality materials. Anyone can use it. It is ergonomically designed, compact, works flawlessly with extremely accurate results. That it can be used for multiple purposes helps reduce the tools that get carried around. With the extra large clamps, we can get it around the largest wires. And the temperature sensor is an added plus. You can’t go wrong providing your crew with this tool. If you have a team of electricians working together, buy one for each team, and don’t forget yourself.

    ✔ Yes, I recommend this product.

  11. a1chef2012

    Easy to read LCD screen show a accurate reading every time.

    I have used Amprobe products for about 20 years now. They were first offered through my local hardware store. I will not buy any other brand. These units are accurate and very easy to use and have saved my bacon from getting zapped a few times when working in a hot environment. Thanks for the great service and would recommend to all of my fellow DYI friends.

    ✔ Yes, I recommend this product.

  12. solow46

    This is one of the most versetile tool

    This is one of the most versetile tool, after schematics, that every technicians ought to have the skills to use it. This instrument does the job superbly. It is easy to use use and the large display make it easy to read. The price makes it it a truly good investment

    ✔ Yes, I recommend this product.

  13. hvacserviceinstructor

    This is great service tool for frontline troubleshooting

    Amprobe ACD-51NAV CAT IV Navigator™ Clamp On Meter 600A with Temperature
    This Navigator Clamp Meter is now one of my daily use meters. I have been using a competitors meter for my HVAC troubleshooting calls years and now I’ve returned to the Amprobe brand. I have worked in the HVAC / Electrical trade for almost 30 years, as a field technician, and using electrical meters is a daily event. I am a HVAC / Electrical Service Instructor at the Union so buying and using meters is a very important part of my career.

    I found this meter is easy to handle and fits great into your hand.
    The selection dial is easy to read with clear selection points.

    I found the hold button strategically placed so you can use your thumb to press it.

    Display light is clear white and lights up the entire display.

    I found the display easy to understand with large numbers to ready in a tight location.

    The navigation joystick allows you to make specific menu function selection changes and I found it easy to figure it out make menu changes on the go.

    The LED work, light below the clamp jaws, is great when you are trying to see into a dark panel or box.

    The battery indicator helps me to know the battery life that is remaining.

    Capacitor testing is really easy with this meter.

    Meter allows measurement of VFD’s with low pass filter

    The non-contact voltage detector is very sensitive and sometimes gives false readings.

    The test leads do not allow for interchangeable lead tips
    The piercing tips on the test leads don’t pierce the wiring insulation very well.

    I would like the meter care to be more water resistant; our Northwest weather requires a better waterproof case.

    ✔ Yes, I recommend this product.

  14. GaryHVAC

    Excellent meter for doing hvac maintenance

    Has many of the features an hvac technician needs volts, amps, resistance, capacitance and microamps. If you want to do air conditioning or motor efficiency this meter is the one to get. If you need to determine harmonics or phase rotation this is a plus feature.

    ✔ Yes, I recommend this product.

  15. Brianc

    Great multimeter

    Very good meter the large screen makes reading the meter easy and the inrush and wattage features are great to have. I have used the phase rotation function more times then I thought I would.

    ✔ Yes, I recommend this product.

  16. Ben1

    Well made.

    Great clamp meter, lots of unique features.
    This meter works as good as any that
    cost a lot more.

    ✔ Yes, I recommend this product.

  17. Camba

    ACD51NAV-In-Rush Current

    I have had the ACD-51NAV for over a year and I enjoy being able to take LRA readings on compressor motors. This meter will also calculate watt readings-it has a selection on the meter. Very well built and at an affordable price.

    Definitely recommend this meter.

    ✔ Yes, I recommend this product.

  18. Doug27


    The only thing lacking is DC amps to be utilized in the Solar and Alternative Energy Industry

    ✔ Yes, I recommend this product.

  19. Mike41


    I use to use only fieldpiece, but after i got my first amprobe, i will never go back to anything but Amprobe.
    i bought this meter after i got my swivel head clamp one, and let me tell you, you cant find anything better then this. Im a HVAC tech, and this meter has served me well and its got everything you need. The inrush feature on this is perfect for capturing the start up on compressors. Along with the 3 phrase testing too.
    I reccommend this meter to anyone in the HVAC industry, its everything you need in a compact size, and the price cant be beat.
    Thank you amprobe for the great meters, keep up the work. the industry needs it!

    ✔ Yes, I recommend this product.

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