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 up to 30A circuits

📏0.1A resolution for precise readings

🔌Fits Micro, Mini & ATO fuse sizes

424 Lei

Duties & taxes included

In stock

Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Fuse testing made effortless — never guess, always know!

ALL IN ONE KIT - Includes three adapters plus a sleek storage pouch for on-the-go pros
COMPACT ACCESSIBLE - Slim design fits tight fuse boxes with ease
DIAGNOSTIC POWERHOUSE - Pinpoint parasitic drains and optimize vehicle battery life
PLUG PLAY PRECISION - Instantly measure circuit amperage without hassle
UNIVERSAL FUSE COMPATIBILITY - Works seamlessly with Micro, Mini, and ATO fuses

The Electronic Specialties 309A Fuse Buddy Mini Kit is a compact, improved diagnostic tool that plugs directly into fuse panels to measure circuit amperage up to 30 amps with 0.1 amp precision. Compatible with Micro, Mini, and ATO fuse sizes, it’s designed for tight spaces and includes three adapters plus a storage pouch, making it an essential tool for professionals tackling parasitic drains and electrical troubleshooting.

Specifications

AC Adapter Current	1 A
ASIN	B083TCDQBH
Best Sellers Rank	#85,360 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #8 in Fuse Accessories
Brand	ES
Brand Name	ES
Color	black
Current Rating	30 A
Customer Reviews	4.6 out of 5 stars 528 Reviews
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
Item dimensions L x W x H	3 x 1.5 x 1 inches
Manufacturer	Electronic Specialties
Material	not_applicable
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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424 Lei

Duties & taxes included

In stock

Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Romania.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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