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Handheld circuit probe tester with green backlit display and pointed tip

OBDResource CP03 0.8-100V DC Circuit Probe Tester

SKU CH-NW66-NHHJ5

Tests DC voltage, resistance, continuity and polarity from 0.8 to 100 V with a backlit display and audible alerts

  • FeaturesCIRCUIT TESTER AUTOMOTIVE, Battery Powered, false
  • Sports Team1 Piece
  • TypeVoltmeter
  • Tests 0.8-100 V DC circuits for automotive faults
  • Smart mode auto-detects voltage, polarity, resistance, continuity
  • Buzzer alerts below 50 Ω; screen shows OL over 100 V
  • Green backlit display readable in bright or dim light
  • Auto power-off after 15 minutes saves battery life

OBDResource CP03 0.8-100V DC Circuit Probe Tester

The OBDResource CP03 is a professional automotive circuit tester designed for technicians and DIYers who need to diagnose DC electrical systems. It measures voltage, resistance, continuity, and battery polarity across a wide 0.8 to 100 V range. The tool suits workshop and roadside checks of lighting circuits, fuse connections, and general wiring faults.

Practical limits of the 0.8-100 V DC interface

The tester operates only on DC circuits within the stated 0.8 to 100 V window; it cannot measure AC mains voltage or signals outside this range. The built-in over-voltage alarm displays "OL" when DC voltage exceeds 100 V, protecting the instrument from damage. A buzzer sounds when resistance drops below 50, giving an instant audible cue for low-resistance paths. The Smart measurement mode automatically identifies the signal type, but the device remains limited to the specified DC functions.

Installation ease and common issues

The probe is battery powered and requires no external supply or complex setup; simply connect the leads to the circuit under test. The bright green backlit LED display remains readable in bright sunlight or dim conditions. An automatic shut-off after 15 minutes of inactivity conserves the internal battery. The ABS and glass-fibre nylon housing provides insulation and durability for workshop use. Common issues include attempting to measure AC voltage or exceeding the 100 V DC limit, which triggers the over-voltage warning.

Highlights

  • Tests 0.8-100 V DC circuits for automotive faults
  • Smart mode auto-detects voltage, polarity, resistance, continuity
  • Buzzer alerts below 50 Ω; screen shows OL over 100 V
  • Green backlit display readable in bright or dim light
  • Auto power-off after 15 minutes saves battery life

Specifications

BrandOBDResource
FeaturesCIRCUIT TESTER AUTOMOTIVE, Battery Powered, false
Sports Team1 Piece
TypeVoltmeter

Questions about this item

Which version of the CP03 should I choose for 12 V automotive work?

The single CP03 model covers 0.8–100 V DC and includes a smart mode that auto-detects voltage, polarity, resistance and continuity, so one unit handles all common 12 V tasks.

What does the 0.8–100 V range mean when I’m probing a live circuit?

It measures DC voltage from 0.8 V up to 100 V, shows resistance and continuity, sounds a buzzer below 50 Ω and flashes OL if voltage exceeds 100 V.

What interface does the probe use and what does that limit in practice?

It connects via a sharp probe tip and ground clip for direct DC circuit contact; the 100 V ceiling and 50 Ω buzzer threshold define the safe measurement window.

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