UNI-T UT15C Waterproof Voltage and Continuity Tester Pen

Specifications

• Voltage Measurement Range (AC/DC): 12V / 24V / 50V / 120V / 230V / 400V / 690V (LED Indicator)
• Digital LCD Display Range: 6V to 690V AC/DC ($\pm 3\% + 5$ digits resolution)
  Phase Rotation Test: $50\text{ Hz} - 60\text{ Hz}$ ($100\text{V} - 690\text{V}$ range)
• Single Pole Voltage Detection: $100\text{V} - 690\text{V}$ AC ($50\text{ Hz} - 400\text{ Hz}$)
• Continuity Test: $0\text{ }\Omega - 100\text{ k}\Omega$ (Buzzer sound and illuminated LED)
• Polarity Detection: Positive (+) and Negative (-) indication for DC voltage
  IP Rating: IP65 (Dust-tight and protected against water jets)
• Safety Rating: CAT III 690V / CAT IV 600V
• Built-in Flashlight: High-intensity white LED light for illuminating dark electrical panels
• Auto-Ranging & Standby: Automated power management with silent low-battery warning
• Power Source: $2\times \text{AAA 1.5V Batteries}$ (Required for LCD backlight, flashlight, and continuity buzzer; basic voltage LED array functions passively)

Applications

• Industrial Electrical Maintenance: Quick testing of 3-phase power distribution panels, motor control centers (MCC), and circuit breakers.
• Phase Rotation Verification: Confirming correct L1-L2-L3 phase sequencing before hooking up 3-phase induction motors or pumps.
• HVAC & Commercial Wiring: Tracing energized lines, verifying neutral ground potential, and testing control transformer outputs.
• Field Service & Automotive Diagnostic: Testing DC vehicle/solar voltages (12V/24V) and continuity of fuses or wiring harnesses.

Unlock New Capabilities

• Past Tools (Prerequisites): Simple neon test screwdrivers or basic non-contact voltage (NCV) detector pens that give false positives from static electricity.
• Feature Upgrade: Upgrading to the UNI-T UT15C unlocks dual visual/audible confirmation, exact numeric LCD voltage levels, 3-phase rotation detection, and single-pole line identification in a rugged waterproof form factor.
• Effort & Experience Required: Intermediate. Ideal for qualified electricians, service engineers, and advanced DIYers comfortable handling mains AC and 3-phase machinery safely.

Package Includes:

• 1 x UNI-T UT15C Waterproof Tester Pen with tethered probe cable
• 1 x User Manual

Frequently Asked Questions (FAQ)

• Does the UNI-T UT15C require batteries to detect voltage?
  No, the primary LED step ladder indicators work passively from the circuit voltage being measured. Batteries are only required for the digital LCD screen, continuity buzzer, and LED flashlight.
• What is the IP rating of the UT15C?
  It has an IP65 rating, making it dust-tight and resistant to splashing or light water jets in outdoor environments.
• Can this tester measure 3-phase voltage systems?
  Yes, it measures up to 690V AC/DC and includes dedicated phase rotation indicators (L and R) for 3-phase power lines.
• What safety CAT rating does the UT15C carry?
  It is certified for CAT III 690V and CAT IV 600V application environments.
• Does the UT15C show exact voltage numbers or just ranges?
  It features both: an LED step scale (12V to 690V) and a digital LCD screen displaying exact numeric voltage values.
• How does the single-pole phase test work?
  Touch probe L1 to the conductor while holding the tester body. It detects live AC lines above 100V without requiring the second probe.
• Can I use this tool to check continuity on a live circuit?
  No. Always isolate and power off the circuit before performing continuity testing to avoid damaging the internal continuity circuit.
• What type of batteries does the UT15C use?
  It uses 2 x AAA 1.5V batteries.
• Does the unit have a built-in work light?
  Yes, it includes a bright front-facing white LED flashlight for working inside dark electrical panels.
• Can it distinguish between AC and DC voltage?
  Yes, the tester automatically detects AC/DC and illuminates positive (+) or negative (-) LEDs for DC polarity.
• What is the frequency response for AC voltage measurement?
  It operates effectively across $50\text{ Hz} - 400\text{ Hz}$.
• What is the maximum voltage measurable with this pen?
  The maximum rated voltage limit is 690V AC/DC.
• Is the probe cable detachable?
  No, the cable connecting probe L1 and L2 is heavy-duty and integrated for IP65 water resistance.
• How do I know if the battery needs replacement?
  When the battery voltage is low, the LCD displays a low battery icon and the continuity buzzer tone will weaken.
• Does it emit an audible sound during voltage measurement?
  The buzzer activates primarily during continuity testing and high-voltage warnings.