Power Probe
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PP401AS (Power Probe 4), US store
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Find on AmazonModel: PP401AS
Current generation with color LCD, multimeter functions and injector/driver modes.
Important limit: Resistance range tops out at 10 kΩ, lower than the PP3+'s 25 kΩ
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Compare versions and packagesSpecifications checked November 5, 2026. Full product details
Carrying case, alligator clip, battery clip set, 3 in (8 cm) probe tip, instruction manual
Power Probe PP401AS Circuit Tester (Power Probe 4)
The fourth-generation Power Probe circuit tester with built-in multimeter functions: AC/DC voltage, resistance, frequency and pulse-width measurement, fuel injector and driver-circuit test modes, a color LCD and power or ground supply at the probe tip.
Selected package: PP401AS (Power Probe 4), US store.
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Model: PP401AS
Current generation with color LCD, multimeter functions and injector/driver modes.
Advanced circuit diagnostics with one tool.
These are different products. Check their specifications separately.
Previous platform: DC voltage and continuity only, no resistance or frequency modes.
Simpler, cheaper routine voltage and polarity checks.
Purchase links appear where the exact offer is verified. Confirm the named model, quantity and accessories before ordering.
| Operating voltage | 8 to 30 V DC |
|---|---|
| Maximum tip voltage | 450 V |
| Probe tip resistance to ground | 130 kΩ |
| Computer safe | 0.1 mA floating tip |
| Voltage measurement | -100 to 200 V DC / VAC (70 VAC RMS) |
| Voltage resolution | 0.01 V (10 mV) from -99.99 to 99.9 V; 0.1 V (100 mV) from 100.0 to 199.9 V |
| Resistance measurement | 0.1 Ω to 10 kΩ |
| Frequency measurement | 1 Hz to 9999 Hz |
| Glitch capture | Minimum pulse width over 380 μs |
| Power feed test | Under 30 mA; shows battery voltage, probe-tip voltage and total circuit resistance together |
| Driver test | 50 Ω pull-up on tip; driver-on range 50 mV to 1 V |
| ECT signal detection | 2 s (works with the ECT3000 circuit tracer) |
| Fuel injector mode | LED flash at minimum 35 V at 100 μs pulse |
| Circuit breaker | 8 A thermal, auto reset (trips in 6 s at 15 A, 2 s at 25 A, 0.3 s on a short circuit; no trip at 8 A) |
| Operating temperature | -20°C (-4°F) to 50°C (122°F); storage -40°C (-40°F) to 65°C (149°F) |
| What's included | Carrying case, alligator clip, battery clip set, 3 in (8 cm) probe tip, instruction manual |
From manufacturer documentation, checked November 5, 2026. Spotted an error? Tell us.
An open-fork electrical tester that measures ac voltage up to 1000 V and current up to 200 A through the fork without contacting live voltage, showing both on one screen.
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A 3-26 V high-impedance automotive logic probe with red and green LEDs that show ground, power and pulse signals, for testing injectors, solenoids and sensors on 6-, 12- and 24-volt systems.
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The Power Probe 3 platform with an added resistance measurement mode: it supplies 12/24 V power or ground at the probe tip, reads DC voltage and polarity, checks continuity and measures resistance from 0 Ω to 25 kΩ, all in one tool with a 20 ft cable.
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