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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⚡ Diagnose like a pro—never miss a circuit beat!

COMPACT PORTABLE - Lightweight 6-ounce kit with handy storage pouch, perfect for on-the-go professionals.
SPACE SAVVY DESIGN - New improved adapters fit effortlessly into cramped fuse panels, no more wrestling with tight spaces.
PRECISION AMP READING - Accurately measures circuit amperage up to 30A with fine 0.1A resolution—diagnostics made easy.
PLUG PLAY EFFICIENCY - Simply plug in and instantly read circuit amp draws—speed up your troubleshooting workflow.
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, black electrical testing tool designed for professionals who demand precision and convenience. 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 plug-in design, it streamlines diagnostics and installations. Lightweight and portable, it includes a storage pouch for easy transport.

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AC Adapter Current	1 Amps
Brand	ES
Item dimensions L x W x H	3 x 1.5 x 1 inches
Mounting Type	Through-Hole Mount
UPC	858834005445
Global Trade Identification Number	00858834005445
Manufacturer	Electronic Specialties
Color	black
Unit Count	1.0 Count
Model	Fuse Buddy
Item Weight	6 ounces
Product Dimensions	3 x 1.5 x 1 inches
Item model number	309A
Manufacturer Part Number	309A

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

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