What type of leads come with the unit, i. e. alligator/pin probe?

Jack, if you wanted to use pin probes they would attach to the alligator clips. The leads on the unit are about 20" long anyway.

I work on old Amps, can it test 350 volt & 450 volt capacitors.this question is pertaining to the Atlas ESR 70

As others have mentioned, it can test those capacitors if they are in their discharged state.The manufacturers specs say - it can auto discharge up to +/- 50v and for a cap that is less than 10uF the absolute maximum it can withstand is +/- 275v, over 10uF that is +/- 50v

Can this unit be used to test capacitors in circuit (without unsoldering)?

Atlas ESR can be used in the circuit. For this reason, also be measured without removing the capacitor from the substrate. Of course, even if you test a capacitor is removed from the circuit, can be measured.

so it only checks capacitance of .1uf or higher?

Its capacitance measurement range is 1uF to 22,000uF with 0.2uF accuracy.

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⚡ Diagnose like a pro, hear the difference!

SAFE RELIABLE - Automatically discharges charged capacitors before testing, protecting you and your device.
PINPOINT PRECISION - Measure ESR with ultra-fine 0.01 ohm resolution for flawless diagnostics.
SMART AUDIBLE ALERTS - Instant sound cues guide you through nominal to critical ESR levels—no guesswork needed.
DYNAMIC RANGE MASTERY - Expanded 0 to 40 ohms range covers everything from tiny to massive capacitors effortlessly.
IN CIRCUIT CONVENIENCE - Test capacitors without desoldering, saving time and preserving your workflow.

The Velleman Atlas ESR70 is a cutting-edge ESR and capacitance meter designed for professionals who demand precision and efficiency. Featuring an enhanced 0.01 ohm resolution and a doubled measurement range up to 40 ohms, it delivers accurate in-circuit testing with automatic discharge protection for charged capacitors. Its innovative audible alerts provide real-time feedback, making capacitor diagnostics faster and more intuitive than ever.

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Manufacturer	Velleman
Part number	166225
Item Weight	96 g
Product Dimensions	0.1 x 0.1 x 0.1 cm; 96 g
Batteries	1 12V batteries required. (included)
Item model number	ESR70
Color	Purple
Style	Modern
Power source type	Battery Powered
Item Package Quantity	1
Number Of Pieces	1
Batteries Included?	Yes
Batteries Required?	No

VellemanAtlas ESR70

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