The UNI-T UT381 illuminance meter measures light levels from 20 up to 20,000 lux across four auto-ranging steps, reading in lux or foot-candles. The sensor sits in the head of a slim 195 mm wand, so you can place it flat on a desk or work surface and read the display comfortably.
With 2044 sets of data storage, an adjustable 0.5~255 s record interval and a real-time clock, it is built for lighting surveys — checking workplace and classroom light levels, commissioning installations, and documenting readings against a standard.
Key Features
- 20~20,000 lux measurement 📏 — four ranges (20 / 200 / 2000 / 20000 lux) with auto ranging.
- ±3% accuracy ✅ — ±(3%+20) on the 20 lux range and ±(3%+8) on the rest.
- Lux and foot-candle units ⚡ — switch between lx and Fc for either standard.
- 2044-set data storage 🔧 — with 0.5~255 s adjustable record intervals for surveys.
- Real-time clock ✅ — timestamps readings so logs mean something later.
- MAX/MIN modes and data hold 🔋 — capture extremes across a space.
- Slim 185 g wand design 📏 — 195 × 45 × 26 mm, easy to position on a work surface.
- Auto power-off 🔋 — around 10 minutes, cancelable, plus restore-to-default mode.
Technical Specifications
| Illuminance range (20 Lux) | ±(3%+20) |
|---|---|
| Illuminance range (200 / 2000 / 20000 Lux) | ±(3%+8) |
| Illuminance range (Fc) | 2 / 20 / 200 / 2000 Fc |
| Display count | 2000 |
| Auto range | Yes |
| Units | Lux / Fc selectable |
| Data storage | 2044 sets |
| Auto record interval | 0.5~255 s |
| Real-time clock | Yes |
| MAX/MIN mode | Yes |
| Data hold | Yes |
| Auto power off | Around 10 minutes (cancelable) |
| Low battery indication | Around ≤7.1V |
| Power | 9V battery (6LF22) |
| Display size | 22.5mm × 32.5mm |
| Product size | 195mm × 45mm × 26mm |
| Net weight | 185g |
| Colour | Red and grey |
What's in the Box
- UT381 illuminance meter
- Carrying bag
- English manual and gift box
Downloads
Certifications: CE, UKCA | HS Code: 9027.50