Coupon code applied successfully.

Sale!

Angled view of the UNI-T UT18C digital voltage and continuity tester featuring an LCD screen and test probes.

UNI-T UT18C voltage tester demonstrating the No Power Test feature on a wall socket for 100-690V operating voltage

Front view of the UNI-T UT18C voltage tester showing the clear 12V to 690V LED indicator scale and LCD display.

The UNI-T UT18C voltage tester splashing into water, demonstrating its IP65 waterproof design for safer use.

Open battery compartment of the UNI-T UT18C voltage tester, which requires two 1.5V AAA (R03) batteries.

Technical specifications table comparing the UNI-T UT18C and UT18D voltage and continuity testers.

UNI-T UT18C voltage and continuity tester highlighting the full-featured LED voltage indication and built-in flashlight for dark environments.

Four application scenarios of the UNI-T UT18C tester: 3-phase voltage test, single pen measurement, continuity test, and RCD test.

Features & Details

⚡ 6V TO 690V AC/DC RANGE	Two-pole electrical voltage tester detects live mains and batteries with LED bar and LCD readout.
🔄 PHASE ROTATION TEST	Determines three-phase sequence (L1-L2-L3) on electrical distribution panels and motors.
🚨 RCD TRIP VERIFICATION	Dual pushbuttons draw load to test 30mA residual current device trip function safely.
🌧️ IP65 WATERPROOF RATING	Dust-tight and water-jet resistant housing with bright torch light for unlit utility meters.

About this item

Product specification

Feature / Parameter

UNI-T UT18C & UT18D Specifications

Core Model Differences

No-Battery Test

UT18C: Supported (Tests 50VAC/120VDC ~ 690V without batteries)
UT18D: Not Supported

LCD Backlight

UT18C: Not Supported
UT18D: Supported (Full Range Backlight)

Measurement Capabilities (Shared Features)

Voltage Indication (V)

12V: 8V ± 2V
24V: 18V ± 2V
50V: 38V ± 4V
120V: 92V ± 6V
230V: 174V ± 8V
400V: 320V ± 10V
690V: 550V ± 15V

Phase Rotation Test

Voltage Range: 100V ~ 690V | Frequency: 50Hz ~ 60Hz

Single Lead (L2) Test

Voltage Range: 100V ~ 690V | Frequency: 50Hz ~ 400Hz

RCD Test

Voltage: 230V | Frequency: 50Hz ~ 400Hz

Hardware, Display & Protections

Advanced Testing

✓ Continuity Test: 0 ~ 100KΩ (with Buzzer & LED Indication)
✓ Polarity Detection: Positive & Negative
✓ Self-test: All LEDs Light Up / Full LCD Display

Hardware Protections

Waterproof Rating: IP65
Overvoltage Indication: Triggers at 713V ~ 788V
Smart Features: Auto Range, Silent Mode, Illumination (Flashlight)

LCD Display Specs

Displays Voltage + Frequency | Range: 6V ~ 690V (40Hz ~ 400Hz) | Accuracy: ±(1.5%+5)

Power Supply

1.5V Battery (R03) × 2 | Auto Standby: Current <10uA
Low Battery Indication: Triggers at 2.3V ~ 2.5V

Professional Electrical Diagnostics & Circuit Verification

UT18C/D Two Pole Voltage Tester Professional Series

Ensuring dependable accuracy during daily operations requires professional equipment engineered to withstand demanding laboratory and industrial environments. The UNI-T UT18C/D Two Pole Voltage Tester (6V-690V AC/DC) provides verified stability, user-friendly operation, and certified safety compliance across standard maintenance protocols. Discover our complete line of diagnostic and testing instruments in the Digital Multimeter catalog.

Comprehensive Testing Functions

Measures AC/DC voltage, current, resistance, capacitance, frequency, and rapid continuity with loud acoustic beeper feedback.

Smart User Features

Data hold freezes fluctuating values on screen, backed by automatic power-off and clear LED display backlighting in dark spaces.

💡

Testing Insight: CAT Rating Isolation in Electrical Multimeters

CAT III and CAT IV rated meters incorporate internal high-energy ceramic fuses and wide PCB creepage spacing to protect operators against explosive transient arc flashes.

Ordering & Model Verification

Verify voltage range, display counts, and included accessories before selecting your model in the right-side order box.

Related technical collections:
Digital Multimeter |
Digital Clamp Meter

Product guides and documents

UT18 User Manual (PDF)

Use Cases

Heavy Duty Design High Voltage Testing Industrial Maintenance Waterproof & Dustproof

FAQs

Q1: What is the maximum voltage range this tester can measure?

A: The UT18C Two Pole Voltage Tester is designed for heavy-duty applications, accurately measuring both AC and DC voltages from 12V up to 690V.

Q2: Does this device support RCD (Residual Current Device) testing?

A: Yes, it features a dedicated RCD test function operating at 230V (50Hz ~ 400Hz). This allows electricians to quickly and safely verify the proper operation of ground fault circuit interrupters and circuit breakers.

Q3: Is the UT18C suitable for harsh or outdoor industrial environments?

A: Absolutely. The rugged housing is IP65 waterproof and dustproof rated. Furthermore, it holds CAT III 690V and CAT IV 600V safety certifications, ensuring maximum operator protection in humid or demanding industrial conditions.

Q4: Can it identify zero and fire wires on a single cable?

A: Yes, it includes a single-lead (L2) voltage detection feature. This allows technicians to easily distinguish between zero and live (fire) wires without needing a complete circuit loop.

Q5: How does the tester indicate continuity and voltage levels?

A: It provides a comprehensive audio-visual feedback system. Voltage levels and test results are clearly displayed on the backlit LCD screen and LED scales, while a loud audible buzzer instantly alerts you during continuity tests.

Q6: Can I use this tester in dark environments, like inside electrical cabinets?

A: Yes, the tester is equipped with a built-in LED illumination flashlight at the probe tip, combined with the backlit LCD screen, making it extremely easy to locate test points and read data in pitch-black environments.

UNI-T UT18C/D Two Pole Voltage Tester (6V-690V AC/DC)

Name: UNI-T UT18C Two Pole Voltage Tester | 690V AC/DC Meter
Brand: UNI-T
Availability: InStock

Price range: $58.99 through $60.99

Extra 5% Off with code: welcome5

color

Clear

6–12 Month Warranty

Repair & Refund support available for most products.

Free Worldwide Shipping

Ships within 3 business days.

Taxes & Duties

Buyer responsible for local import fees.

24/7 After-Sales Support

Technical assistance & video guidance within 24h.