What is the UT18C voltage tester?
The UT18C is a rugged, high-performance voltage tester made for sparkies and techs who work in tough environments. It’s packed with essential safety features and advanced diagnostics you can count on.
Table of contents
Key features
This tester helps you get safe, accurate results fast—whether you're inspecting panels or working on three-phase power.
- ✅ Measures AC/DC voltage from 6V to 690V including three-phase systems
- ✅ Phase rotation test and visual phase indication
- ✅ Built-in RCD test function for switchboard safety checks
- ✅ Auto-ranging with data hold for convenience
- ✅ LED indicators and built-in light – easy to read even in dark switchboards
- ✅ CAT IV 600V safety rating for high-risk environments
- ✅ IP65-rated – dustproof and water-resistant for harsh worksites
- ✅ Auto standby and low battery alert around 2.5V
Specs & performance
Engineered to meet professional demands in industrial or commercial settings.
- ✅ Voltage range: 6V–690V with high precision
- ✅ RCD test: Operates at 230V (50–400Hz)
- ✅ Phase rotation: Detects between 57V–400V, 50–400Hz
- ✅ Continuity check: Resistance up to 100kΩ with audio/visual alerts
- ✅ Silent mode, over-voltage warning, and polarity detection built in
- ✅ Standby current under 10μA for battery life extension
What's included
All the essentials to get started right away—no extras needed.
- ✅ 1 x UT18C Voltage Tester
- ✅ Batteries included
- ✅ Easy-to-follow English manual
- ✅ Backed by a 12-month warranty
Who it’s for
Designed for electricians, industrial technicians, and anyone working on smelting sites, manufacturing floors, or exposed outdoor switchgear. If you need a tester that stands up to the elements and won’t miss a beat, the UT18C is it.
✅ Comparison Chart: UT18C vs UT15C Voltage Tester
| Feature | UT18C | UT15C |
|---|---|---|
| Voltage Range | 6V to 690V AC/DC | 12V to 690V AC/DC |
| RCD Test | ✅ Yes (230V, 50–400Hz) | ❌ No |
| Phase Rotation Detection | ✅ Yes | ❌ No |
| IP Rating | IP65 – Dust & water resistant | IP65 – Dust & water resistant |
| CAT Safety Rating | CAT IV 600V | CAT IV 600V |
| Continuity & Diode Test | ✅ With audio-visual alert | ✅ With alert |
| Polarity Detection | ✅ Yes | ✅ Yes |
| Silent Mode | ✅ Yes | ✅ Yes |
| Built-in Light | ✅ Yes | ✅ Yes |
| Battery Saver | Auto standby, <10μA drain | Auto power off |
| Best For | Industrial & multi-phase testing | General voltage testing and basic continuity |
| Weight & Build | Slightly heavier, more rugged | Lightweight, compact |