UNI‑T UT18D Voltage & Continuity Tester

The UNI‑T UT18D is a professional‑grade voltage tester from the UT18 series, designed for AC/DC voltage measurement, three‑phase voltage/phase‑sequence detection, continuity testing and more. It offers high safety protection (CAT IV 600 V) and rugged build with IP65 rating, making it suitable for demanding electrical installation environments. :contentReference[oaicite:1]{index=1}

Key Features

• Wide voltage range: Measures AC/DC voltage from approx. 6 V up to 690 V. :contentReference[oaicite:2]{index=2}
• Phase‑sequence (3‑phase) test: Supports 57 V~400 V for three‑phase phase rotation detection. :contentReference[oaicite:3]{index=3}
• Continuity test: Resistance approx. 0 Ω to 100 kΩ with buzzer/LED indication. :contentReference[oaicite:4]{index=4}
• RCD (Residual Current Device) test: Built‑in test for 230 V systems. :contentReference[oaicite:5]{index=5}
• Large LCD display & work‑light: Provides clear read‑out and illumination for dark or cramped environments. :contentReference[oaicite:6]{index=6}
• Rugged & safe build: Category CAT IV 600 V, IP65 protection (dust & water resistant). :contentReference[oaicite:7]{index=7}

Specifications (Selected)

• Voltage ranges (AC/DC): 5 V ± 1V (low range), 12 V / 24 V / 50 V / 120 V / 230 V / 400 V / 690 V – each with specified accuracy. :contentReference[oaicite:8]{index=8}
• IP & safety rating: IP65, CAT IV 600 V / CAT III 690 V depending on regional listing. :contentReference[oaicite:9]{index=9}
• Dimensions & weight: Approx. 272 × 85 × 31 mm; weight ~280 g. :contentReference[oaicite:10]{index=10}
• Power supply: 2 × 1.5 V (R03/AAA) batteries. :contentReference[oaicite:11]{index=11}

Why Choose the UT18D?

• Combines advanced functionality (phase sequence, RCD test, continuity) with robust safety ratings, making it ideal for professional electricians in industrial or commercial settings.
• High visibility display, backlight and work‑light enhance usability in poorly lit or confined spaces.
• IP65 rating means it can withstand dusty or splash‑prone environments better than many basic testers.

Usage & Considerations

• Although the unit covers wide voltage ranges and has many features, always verify the correct test category and system being measured; misuse can lead to unsafe situations.
• This tester is more about checking voltage presence/phase/continuity rather than precise quantitative measurement (like detailed multimeters) – choose accordingly.
• Automatic standby, silent mode and battery‑low indication are useful features for fieldwork, but ensure batteries are in good condition before critical tests. :contentReference[oaicite:12]{index=12}

Keywords

UNI‑T UT18D, UT18 series, voltage tester up to 690 V, phase sequence tester, CAT IV 600 V tester, IP65 voltage & continuity tester