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

Product ID: 356576351

Details

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

⚡Tests up to 30A circuits

🔌Compatible with Micro, Mini & ATO fuses

🛠️Improved adapters for tight fuse boxes

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HK$772

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Diagnose Like a Pro, Anywhere, Anytime!

TRUSTED TESTED - Backed by a 1-year manufacturer warranty and a stellar 4.6-star rating from nearly 500 pros.
SPACE SAVVY DESIGN - New improved adapters fit snugly in tight fuse panels, no more wrestling with cramped spaces.
COMPACT ORGANIZED - Includes a sleek storage pouch to keep your Fuse Buddy and adapters ready for action anywhere.
PLUG PLAY PRECISION - Instantly read circuit amperage up to 30A with 0.1A resolution for flawless diagnostics.
UNIVERSAL FUSE COMPATIBILITY - Seamlessly tests Micro, Mini, and ATO fuse sizes—one tool for every job.

The Electronic Specialties 309A Fuse Buddy Mini Kit is a compact, black electrical testing tool designed for quick and accurate amperage readings up to 30 amps. Featuring improved adapters for tight fuse boxes, it supports Micro, Mini, and ATO fuse sizes, delivering 0.1 amp resolution. The kit includes a storage pouch and comes with a 1-year warranty, making it a reliable choice for professional diagnostics and installations.

Specifications

ASIN	B083TCDQBH
Brand Name	ES
Color	black
Current Rating	30 Amps
Customer Reviews	4.6 4.6 out of 5 stars (494)
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 centimeters
Item Type Name	Fuse Buddy Mini Kit - Improved
Manufacturer	Electronic Specialties
Material Type	Glass
Maximum Current	1 Amps
Model	309A
Mounting Type	Through-Hole Mount
Part Number	309A
UPC	858834005445
Unit Count	1 Count
Warranty Description	1 year manufacturer

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