What is the smallest ac and dc current you can measure? Is the dc measurement small enough to hunt down parasitic battery drains in a 12v car?

You need to look at both resolution (0.01A on 40A setting) and accuracy. For example, if you try to measure a 50 mA current... ±(%2 reading ±5 digits) from the manual 50 mA = 0.05 A >> accuracy is ±(1 mA ±5 digits) >> 50 mA ±50 mA !!! Remember, those ±5 digits mean ±50 mA, because the smallest digit represents 0.01A. And that means that you can see a value of 0.00 to 0.10 A when you measure 0.05A (50 mA). Choose meter 10X needed resolution. Here, res = 0.01A, so use for measurements > 0.1 A. But if all you need is a rough measurement, such as finding that a parasitic current is more than 100 mA, but you don't care what the exact value is, then this will work fine. But if you are trying to find if the idle current is 50 or 100 mA, this might not be a good choice.

The Fluke 325 spec sheet shows current range as 40A - 400A for both AC and DC. How do you switch the meter from 40A range to 400A range?

Stephen, you peaked my curiosity so went looking on the Fluke site. It was worthless so got out the unit and tried it on a DC telephone line from a hydronic zone valve to the water heater and it measured .46 amps (probably in milliamps) on the meter. Then switched it to the AC line and clamped around a line leading to a 500-watt work light and it measured .05 amps (which should have been no more than 15A. I think the difference has to do with the base as the DC amps should certainly be less than the AC amps. Anyway it does measure but had to learn how to use it.

DOES THIS TESTER TEST DC AMPS

Yes it will. Unfortunately if you are used to the great 337 that had their own switch positions this one you have to learn to push the "zero" button to put it into the DC mode. It is the same with AC and DC volts. Button must be pushed to change to DC. Hope this helps. WW

does this measure as little as 5 amps dc?

Yes it will read as little as .01 amp dc

Fluke Battery Powered Fluke 325 325 400a Ac Dc True

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Description

⚡ Clamp the Current, Own the Moment!

POWER ON THE GO - Battery-powered design means no cords, no limits—work anywhere, anytime.
LIGHTWEIGHT COMPACT - At just 295 grams, it’s easy to carry and handle during complex diagnostics.
TRUSTED INDUSTRY LEADER - Fluke’s renowned reliability backed by 4.7-star rating from over 1,100 pros.
PRECISION MEETS PORTABILITY - True RMS technology ensures accurate AC/DC current readings every time.
BUILT FOR EXTREME CONDITIONS - Operates safely up to 400°C, ready for the toughest industrial environments.

The Fluke-325 is a battery-powered, digital True RMS clamp meter capable of measuring up to 400A AC/DC current with high precision. Lightweight and compact, it’s designed for professionals needing reliable, portable diagnostics in demanding industrial settings. With a strong reputation and excellent user ratings, it’s a must-have tool for modern electrical troubleshooting.

Specifications

ASIN	B0091EXB2A
Best Sellers Rank	#19,141 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #68 in Clamp Meters
Brand	Fluke
Brand Name	Fluke
Colour	Yellow
Country of Origin	Malaysia
Customer Reviews	4.7 out of 5 stars 1,146 Reviews
Global Trade Identification Number	00095969623766, 00696335208978
Importer Contact Information	FLUKE TECHNOLOGIES PVT LTD, bldg 205/206/207, indian corporation, warehousing complex, opp gajanan petrol pump mankoli naka bhiwandi, thane; Tel: 03633-645327
Included Components	1 x Clamp Meter
Item Dimensions	24 x 27.9 x 8 Centimeters
Item Type Name	Clamp Meter
Item Weight	295 Grams
Item dimensions L x W x H	24 x 27.9 x 8 Centimeters
Manufacturer	Fluke, Fluke Technologies Pvt Ltd, Art Guild House, Kurla West Mumbai-400070
Manufacturer Contact Information	Fluke Technologies Pvt Ltd, Art Guild House, Kurla West Mumbai-400070
Measurement Type	Clamp Meter
Minimum Operating Voltage	1 Volts
Model Number	FLUKE-325
Packer Contact Information	Fluke Technologies Pvt Ltd, Art Guild House, Kurla West Mumbai-400070
Power Source	Battery Powered
Power Source Type	Battery Powered
Style	Digital
Style Name	Digital
UPC	095969623766
Unit Count	1 Count
Upper Temperature Rating	400 Degrees Celsius

Reviews

S**S

Good product

Nice

21.10.2024

A**I

EXCELLENT PRODUCT

Excellent Product by Vishal Enterprises

2.11.2022

S**Y

Orignal from fluke

All contactless meters are less accurate. DC Amp measurement is prone to stray magnetic field. Else it is Fluke & does the job well.

4.12.2019

H**L

Very good service

Good product

14.05.2025

G**E

Good meter without diode function

This is ultimate meter, I bought few days back, Everything is good, But it don't have diode mode to check diode, Moreover it has very low resistance check value, means it can check resistance up to 40000 ohms, Also capacitance range is also low, But however accuracy is supreb and fast reading, Frequency can be measure by clamp.

12.06.2018

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