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: 183112102

Details

AC Adapter Current
1 A
Brand
ES
Item dimensions L x W x H
3 x 1.5 x 1
Material
Mounting Type
Through-Hole

⚡Tests Micro, Mini & ATO fuses

📏Measures up to 30A with 0.1A resolution

🔌Plug-in direct fuse panel access

$135.48

Duties & taxes included

In stock

Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Diagnose Like a Pro, Fuse Like a Boss!

ALL IN ONE KIT - Includes three adapters, clear storage pouch, and manual—everything you need in one sleek package.
PRECISION AMP READING - Accurately measures circuit amperage up to 30A with fine 0.1A resolution for confident diagnostics.
PLUG PLAY CONVENIENCE - Simply plug into the fuse panel and instantly read circuit loads—diagnostics made effortless.
COMPACT IMPROVED DESIGN - New adapters fit snugly in tight fuse boxes—no more wrestling with cramped spaces.
UNIVERSAL FUSE COMPATIBILITY - Seamlessly tests Micro, Mini, and ATO fuse circuits for ultimate versatility.

The Electronic Specialties 309A Fuse Buddy Mini Kit is a compact, improved diagnostic tool designed for professional-grade fuse testing. Compatible with Micro, Mini, and ATO fuses, it plugs directly into fuse panels to provide precise amperage readings up to 30 amps with 0.1 amp resolution. Its new adapters ensure easy access in tight spaces, making it an essential accessory for electricians and DIY pros seeking quick, reliable circuit diagnostics.

Specifications

ASIN	B083TCDQBH
Best Sellers Rank	#116,700 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #7 in Fuse Accessories
Brand Name	ES
Color	black
Current Rating	30 A
Customer Reviews	4.6 4.6 out of 5 stars (519)
Global Trade Identification Number	00858834005445
Included Components	Battery, Clear storage pouch, Fuse Buddy, Instruction manual, Three adapters
Item Dimensions	3 x 1.5 x 1 inches
Item Type Name	Fuse Buddy Mini Kit - Improved
Manufacturer	Electronic Specialties
Material Type	not_applicable
Maximum Current	1 A
Model	309A
Mounting Type	Through-Hole Mount
Number of Items	1
Number of Packs	1
Part Number	309A
UPC	858834005445
Unit Count	1 Count
Warranty Description	1 year manufacturer

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