URCERI SMT912

The URCERI SMT912 ranked first in Amazon’s photographic light meter category on the check date and, at about $30, is the cheapest meter here. On paper it matches meters that cost more: 0 to 200,000 lux, ±3% of reading ±8 digits below 10,000 lux and ±4% ±10 digits above, a color display, and a 2-year warranty.

The problem is that the paper is all there is. No manufacturer website turned up and no independent measurements of this model could be found. The listing also claims spectral match within 6% (f1′) and cosine error within 2% (f2), figures that would rival the Konica Minolta T-10A, with no calibration light source or test report to back them.

Budget meters that have been tested against reference instruments vary widely. In one 2018 comparison, a $16 meter read some LEDs over 30% low, while an $18 meter averaged a 2.1% calibration offset (Budget Light Forum). Without test data there is no way to know where the SMT912 falls.

The sensor is built into the body. To get a clean reading you need to hold the meter at eye height, sensor facing the light, and keep your hand and head out of the way.

As with any meter that has a fixed “digits” error term, dim readings are rough. At 10 lux, the ±8 digit term alone can swamp the reading, so it is not a good tool for checking evening or bedroom light levels.

For a few dollars more, the Dr.meter LX1330B has a separate sensor probe and published independent test data, and the UNI-T UT383BT adds phone logging. Choose the SMT912 only if price is the deciding factor and a rough reading is enough.