How does this compare to the 310 model?

310 has 30 Amp clips allowing it to be used as a portable amp meter. Further, the head unit has upgraded display with analog bargraph and data hold. 310 does not have an adapter for the new micro fuses, we are currently working on that.

Is the probe fused to protect the meter?

You remove the car fuse and plqce it in the tester’s receptacle. The car fuse protects any overload.

Is 0.1A resolution, that would be 1.2W, fine enough to find a power leak that takes days to drain a battery?

Maximum allowable draw is usually 0.050 amps or 50 ma. So this tester would help if your battery went dead overnight possibly but not for anything that takes days. Now for the reason I like it. If you're adding accessories to a vehicle, you can use it to calculate startup loads and running loads to appropriately size wiring and fuses. For this reason I recommend it.

What kind of battery do you need? Is it a standard size? Do you also sell the batteries if they are not standard sized ones?

A23 battery, readily available. Here's a listing for sale on Amazon. https://www.amazon.com/Energizer-Mercury-Alkaline-Batteries-Packaging/dp/B00004YK10?th=1

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ES Electronic Specialties - 309A Fuse Buddy Mini Kit - Improved,black

Product ID: 246594036

Details

AC adapter current
1 Amps
Brand
ES
Item dimensions L x W x H
7.6 x 3.8 x
Material
Ceramic Copper
Mounting type
Through-Hole

⚡Tests Micro, Mini & ATO fuses

📏Measures up to 30 Amps with 0.1A precision

🔌Plug-in design for instant readings

20007 kr

Duties & taxes included

In stock

Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Fuse Buddy Mini Kit: Power up your diagnostics with precision and ease!

COMPACT ACCESSIBLE - New improved adapters fit tightly spaced fuse boxes, making testing easier than ever.
ON THE GO CONVENIENCE - Includes a sleek storage pouch—carry your Fuse Buddy Mini Kit anywhere and never miss a diagnostic beat.
PLUG PLAY DIAGNOSTICS - Instantly plugs into fuse panels for real-time circuit amp readings—no hassle, no guesswork.
PRECISION AMP MONITORING - Accurately measures current up to 30 Amps with fine 0.1 Amp resolution for professional-grade diagnostics.
UNIVERSAL FUSE COMPATIBILITY - Seamlessly tests Micro, Mini, and ATO fuse circuits for ultimate versatility.

The ES Electronic Specialties 309A Fuse Buddy Mini Kit is a compact, plug-in electrical testing tool designed for professional and DIY use. It supports testing of Micro, Mini, and ATO fuse circuits up to 30 Amps with 0.1 Amp resolution. Featuring improved adapters for tight fuse box access and a handy storage pouch, it delivers quick, accurate circuit amp readings to streamline diagnostics and installations.

Specifications

AC adapter current	1 Amps
ASIN	B083TCDQBH
Best Sellers Rank	651,289 in DIY & Tools ( See Top 100 in DIY & Tools ) 2,837 in Fuses & Holders
Brand	ES
Colour	black
Current Rating	30 Amps
Customer Reviews	4.6 out of 5 stars 511 Reviews
Global Trade Identification Number	00858834005445
Included Components	Battery, Clear storage pouch, Fuse Buddy, Instruction manual, Three adapters
Item Dimensions	7.6 x 3.8 x 2.5 centimetres
Item Type Name	Fuse Buddy Mini Kit - Improved
Item dimensions L x W x H	7.6 x 3.8 x 2.5 centimetres
Manufacturer	Electronic Specialties
Manufacturer Part Number	309A
Material	Ceramic , Copper , Plastic
Maximum Current	1 Amps
Model Number	309A
Mounting Type	Through-Hole Mount
Mounting type	Through-Hole Mount
Number of Items	1
Number of Packs	1
UPC	858834005445
Unit Count	1.0 count

Reviews

A**E

Handy for parasitic draw measuring moderate loads

Good tool for monitoring moderate draw accurately, is also strong enough to check blower motor and lighting circuit draw quickly by plugging in place of fuse. Would be nice if tool came with resettable circuit breakers, you need to plug the removed fuse in the tool to complete circuit. Works very well

2.05.2026

R**S

Great Product

"Excellent product! Works exactly as described, high quality, and exceeded my expectations. Highly recommend!"

19.04.2026

A**R

great

worked great just what i needed

25.02.2026

O**T

Works great

9.05.2026

W**N

Good price

Nice addition

28.12.2025

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