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, Anywhere, Anytime!

PORTABLE ORGANIZED - Includes a sleek storage pouch to keep your Fuse Buddy Mini Kit ready for any job on the go.
PRECISION AMP READING - Accurately measures circuit amperage up to 30A with fine 0.1A resolution—no guesswork needed.
PLUG AND PLAY CONVENIENCE - Simply plug in and instantly read circuit amp draws—speed up your troubleshooting workflow.
COMPACT ACCESSIBLE DESIGN - New adapters engineered for easy access in cramped fuse panels—diagnostics made effortless.
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, precision tool designed for professional-grade electrical diagnostics. 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 convenient storage pouch, it streamlines fuse testing and circuit troubleshooting for electricians and tech-savvy professionals alike.

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RM448

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Malaysiastore

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Manufacturer	Electronic Specialties
Brand	ES
Model	Fuse Buddy
Product Dimensions	7.62 x 3.81 x 2.54 cm; 170 g
Item model number	309A
Manufacturer Part Number	309A
Item Weight	170 g

ES Electronic Specialti - 309A Fuse Buddy Mini Kit - Improved

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