Amprobe AMP-330 1000A AC/DC TRMS Motor Maintenance Clamp Meter

(18 customer reviews)

  • Measures AC/DC Current to 1000 A and AC/DC Voltage to 1000 V
  • Measures temperature from -40° to 752°F, (-40° to 400°C)
  • Measures DC Microamps output to test proper operation of the flame sensor on gas appliances
  • Measures capacitance, test diodes, and features a continuity beeper
  • Tests 3-phase sequence and motor rotation to ensure proper connection of a motor to a 3-phase system
  • Monitors inrush current during motor start-up
  • Features True-RMS sensing for accurate voltage measurements in noisy electrical environments
  • Amp-Tip function delivers precise low AC current measurements – 0 to 60 A
  • Includes a low pass filter to accurately measure voltage and current on variable frequency drives
  • Provides resistance and continuity measurement capabilities to verify the quality of electrical connections and the proper operation of motor and transformer coils
  • Provides data hold, relative zero, and MAX/MIN/AVG mode for quick analysis
  • Maximizes battery life with auto power off and low battery indicator
  • Backlit display for easy measurement viewing in bright and dim environments
  • CAT IV 600 V, CAT III 1000 V safety rated
  • Boasts peak hold and work light
  • Accommodates conductors up to 2.0 inches (51 mm)

SKU: 4560570 Category:


If you’re looking for a versatile clamp-on amp meter for electrical motor maintenance and HVAC testing in high voltage industrial environments, the AMP-330 Clamp Meter is the best clamp meter for the job. It is the best clamp meter in the AMP-300 Series line including all the features of the AMP-320 plus a work light, peak hold, CAT IV 600 V, CAT III 1000 V safety rating and large 2.0 inch (51 mm) jaw. HVAC technicians will find the temperature and capacitance measurements they need plus DC Microamps for testing flame sensors. It also had core motor testing capabilities such as motor rotation, 3-phase sequence testing, and inrush current measurement for motor start-up monitoring. The low pass filter allows you to accurately measure current and voltage on variable frequency drives. The Amp-Tip function allows for precise measurement of current down to the tenth of an Amp, enabling accurate current measurement of both large and small diameter wires. It also offers a full range of standard multimeter features, including AC/DC current, AC/DC voltage, frequency, True-RMS, non-contact voltage detection, resistance, and continuity.

Additional information

Safety Rating

CAT IV 600 V


AC Voltage (V)

1000 V

DC Voltage (V

1000 V

AC Current (A)

1000 A

DC Current (A)

1000 A




Frequency (Test Leads)

Frequency (Jaw)

Relative Zero


Diode Test

Continuity Beeper

Non-Contact Voltage


Phase Rotation Indication

Motor Rotation Tes

Inrush Current


Bar Graph

Data Hold

Peak hold (Crest)

Auto Power-Off

Work light (LED)



Low Pass Filter


FEATURE AMP-210 AMP-220 AMP-310 AMP-320 AMP-330
AC voltage (True-rms) Range: 0 to 600.0 V 0 to 1000.0 V
Accuracy: ±1.0% + 5LSD (50 to 60 Hz) ±0.8% + 5LSD (50 to 60 Hz)
DC voltage Range: 0 to 600.0 V
Accuracy: ±1.0% + 5LSD
AC+DC voltage Range: 0 to 600.0 V 0 to 600.0 V 0 to 1000.0 V
Accuracy: ±1.2% + 7LSD (50 to 60 Hz) ±1.2% + 7LSD (50 to 60 Hz) ±1.0% + 7LSD (50 to 60 Hz)
±1.8% + 7LSD (DC 40 to 200 Hz)
±1.2% + 7LSD 200 to 400 Hz)
AC current Range: 0 to 600.0 A
Accuracy: ±1.8% + 5LSD (50 to 60 Hz)
±2.0% + 5LSD (100 to 400 Hz)
DC current Range: 0 to 600.0 A 0 to 600.0 A 0 to 1000.0 A
Accuracy: ±2.0% + 5LSD (DC 50 to 100 Hz) ±2.0% + 5LSD (DC 50 to 100 Hz) ±1.8% + 5LSD (DC 50 to 100 Hz)
AC+DC current Range: 0 to 600.0 A 0 to 600.0 A 0 to 1000.0 A
Accuracy: ±2.2% + 7LSD (DC 50 to 100 Hz)
±2.7% + 7LSD (100 to 400 Hz)
±2.2% + 7LSD (DC 50 to 100 Hz)
±2.7% + 7LSD (100 to 400 Hz)
±2.2% + 7LSD (40 to 100 Hz)
±2.5% + 7LSD (100 to 400 Hz)
Precise low current AC Range: 0 to 60.00 A
Accuracy: ±1.5% + 5LSD (50 to 60 Hz) ±1.5% + 5LSD (50 to 60 Hz)
±2.0% + 5LSD (0.00 to 20.00 A, 100 to 400 Hz)
±3.0% + 5LSD (>20.00 to 60.00 A, 40 to 100 Hz)
±3.0% + 5LSD (>20.00 to 60.00 A, 100 to 100 Hz)
Precise low current DC Range: 0 to 60.0 A 0 to 60.0 A 0 to 60.00 A
Accuracy: ±2.0% + 5LSD ±2.0% + 5LSD ±1.5% + 5LSD (0.00 to 20.00 A)
±3.0% + 5LSD (>20.00 to 60.00 A)
Micro amps Range: 0 to 2000 µA
Accuracy: ±1.0% + 5LSD
Frequency Range: 5.00 to 999.9 Hz
Accuracy: ±1.0% + 5LSD (600 V range)
Range: 50.0 to 400.0 Hz
Accuracy: ±2.0% + 4LSD (600 A range)
Resistance Range: 0.0 to 60.00 kΩ
Accuracy: ±1.0% + 5LSD
Capacitance Range: 0.0 to 2500 µF
Accuracy: ±2.0% + 4LSD
Continuity beeper ON ≤ 10 Ω
Off > 250 Ω
(Type K thermocouple)
-40.0 to 752 °F
-40.0 to 400 °C
±1.0% + 3.0 °F (-40.0 to 14.0 °F)
±1.0% + 1.5 °F (>40.0 to 99.9 °F)
±1.0% + 2.0 °F (100 to 752 °F)
±1.0% + 1.5 °C (-40.0 to 10.0 °C)
±1.0% + 0.8 °C (>-10.0 to 99.9 °C)
±1.0% + 1.0 °C (100 to 400 °C)
Non-contact voltage 10 V to 1000 V AC (50 to 60 Hz)
Phase rotation indication Rotation-R for main supply
Rotation-M for motors
Diode test
Jaw opening 1.18 in (30 mm) 1.37 in (35 mm) 1.18 in (30 mm) 1.37 in (35 mm) 2.0 in (51 mm)
Safety rating CAT III 600 V CAT IV 600V
CAT III 1000 V
Special Features
In-rush current
Peak hold (Crest)
Relative zero
Data hold
Auto power off
Work light

*Error does not include Type-K thermocouple errors


AMP-200/300 Series

Learn about the AMP 200 and 300 Series Motor Maintenance Clamps.

What’s Included

  • AMP-330
  • Banana Plug Type-K Thermocouple
  • Test Leads
  • Alligator Clip Set
  • (2) AAA Batteries (installed)
  • Carrying Case


Datasheet »
Product Manual »

18 reviews for Amprobe AMP-330 1000A AC/DC TRMS Motor Maintenance Clamp Meter

  1. Spike

    T24 Acceptance testing features

    Overall- No issues. This product has the capabilities of reading amperage to the 100th which is critical when testing LED fixtures during a demand response event test.

    ✔ Yes, I recommend this product.

  2. GP55

    I like this New Meter.

    This new Meter works Great. I do miss the Extendo leads from my old. Amp Probe ? Also I wish this Meter had A Magnet on it like my Amp Probe Mulit Meter. All And A Great Meter I love all of the Features that it has. I Use this For HVAC work. Had to finally go Digital even though my old. Analog Meter is still working. Amp 3a, Keep up the good Work I Have Used AMP Meters for years. Always top Quality and Rugged.
    Keep up the good Work!

    ✔ Yes, I recommend this product.

  3. gfolse

    This product is loaded with great features.

    The AMP-330 1000A AC/DC TRMS Motor Maintenance CLAMP METER is of good quality. It is a bunch of test meters rolled into one. You do not have to carry along separate meters to make electrical tests, whether it is AC or DC circuit being tested.

    ✔ Yes, I recommend this product.

  4. Aaron84

    Awesome Multi function Clamp Multimeter!

    I’m an Industrial Maintenance Electrician, and was looking for a new multi function clamp meter to use for everyday fault finding applications in a heavy industrial environment. I had never heard of Amprobe before, but after reading through the design specs, and hours spent trolling the internet for reviews on their products, I decided to go with the AMP-330.

    I’ve been using it for around a month now, and I absolutely love it. Firstly straight out of the box, the build quality is evident, this is a rugged meter. It is comfortable to hold and you can easily change the function mode one handed. It also comes with great quality test leads and handy alligator clips that push on right over the test probes.

    There are too many functions to list, but the following are my favorite:

    – The quick response time for taking measurements.

    – Supply phase rotation and motor phase rotation.

    – 1000A Clamp and the ability to switch between Current (A) and Frequency (Hz) whilst using the clamp at the touch of a button.

    – AC and DC current measurement through the clamp.

    – Nice large back lit display and built in work light.

    – Non contact voltage detection.

    – CAT IV 600V rated.

    All in all this is a beautifully made meter with a huge amount of handy functions squeezed into a small package, and I have no hesitation in recommending this to everyone.

    On a side note, if you don’t need a 1000A clamp and a CAT III 600V rating is all you need for the work you do, have a look at the AMP-320 600A Clamp Meter, it has nearly all the same functions but comes in a more compact size.

    ✔ Yes, I recommend this product.

  5. LR67

    !!Grate product!!

    I use the AMP-300 meter in the plastic industries to check all kind of electric the problems in the injection molding machines,
    this devices do all what I need in AC or DC,

    ✔ Yes, I recommend this product.

  6. BillW

    Great Meter for Electrical Maintenance

    I’ve owned this meter for 4 years and it has never disappointed. The AC/DC amps is very useful for a variety of AC motor/power distribution and automotive uses. Microamp range for working on thermocouple heating devices. Intuitive and easy to use selection. Type-K temperature readings. It is my go to meter for all electrical maintenance issues.

    ✔ Yes, I recommend this product.

  7. Rward2312

    This product is amazing

    This product is worth the money does everything any high dollar meter does

    ✔ Yes, I recommend this product.

  8. Skotty319

    Great value and construction

    My amprobe clamp meter has been through heck and back with me and just doesn’t quit! I wouldn’t recommend any other brand for maintenance!

    ✔ Yes, I recommend this product.

  9. Bob269

    great product

    I have had this meter for a year and a half. It is easy to use and very efficient.

    ✔ Yes, I recommend this product.

  10. John43

    Excellent meter

    I use this amp clamp daily on HVAC and electrical systems. Absolutely love this unit!

    ✔ Yes, I recommend this product.

  11. Kgunn25

    This was a great buy

    I love my amp 330 it is very accurate. It was one of the best buys.

    ✔ Yes, I recommend this product.

  12. JasonS

    Great Meter with excellent features.

    This meter has all the needed options for diagnosing motor issues and saves me from having to carry multiple test instruments with me in the field when trouble shooting motor and VFD issues as well as general electrical testing.

    ✔ Yes, I recommend this product.

  13. JOSEPH40511

    Excellent Durability, Reliability, and Accuracy

    I have an Improve 330 and love it. Working in a maintenance facility we have to troubleshoot electrical problems and motors. This meter works great because it keeps me from having extra tools to check phase rotation. It is reliable and has never failed me.

    ✔ Yes, I recommend this product.

  14. Radar00

    This is my go to meter

    This is one of the best meters I have ever owned. It has never failed and always accurate. I actually use this to double check some other products. It’s very tough. I use it daily underground in a coal mines.

    ✔ Yes, I recommend this product.

  15. Aar27

    The one meter to have with you

    This is one of the most complete meters on the market.
    It has every feature you’ll need on a daily basis and should be the first meter you grab on the go.
    The AMP-330 is well built and very accurate. It’s worth purchasing.

    ✔ Yes, I recommend this product.

  16. fullonthripist

    Best Meter I’ve Owned

    I finally decided to upgrade my home multimeter to something I will never grow out of, and I couldn’t be happier with my decision. I use the parent company’s meters (Fluke) at work, and just like them, I don’t have any qualms about any of the readings I’ve obtained from capacitance to dc amps using this meter. It’s a great bang for the buck.

    The AMP-330 meter itself is great, but I have two minor gripes which aren’t enough to drop a star:

    1.) I wish this was USA or German made, as long as the unit didn’t increase significantly in price (~20%). But I understand this may not be possible without compromising quality.

    2.) As of the date of my purchase (Aug 2018), there is an error in the English portion of the user manual. Page 18 in the English section is actually in German.

    ✔ Yes, I recommend this product.

  17. Junior04

    Amp 330 multi meter

    This is a very good tool easy to use to check voltage or clamp it on and check how many amps anything is drawing

    ✔ Yes, I recommend this product.

  18. Prod

    I love all of the Features this meter has. I am an HVAC Service Tech.

    I use this meter most days while trouble shooting
    Furnace and A/C Repairs. If you needed one all around
    Meter this would be it. Very versatile. Also very Accurate.
    I have several Amprobe meters.

    ✔ Yes, I recommend this product.

Add a review

Your email address will not be published. Required fields are marked *

The maximum upload file size: 700 MB. You can upload: image, audio, video, document, spreadsheet, interactive, text, archive, code, other. Links to YouTube, Facebook, Twitter and other services inserted in the comment text will be automatically embedded. Drop file here