A CLOSER LOOKTools
Put the sensor at the leaves. Keep the display in hand.
UNI-T UT383S Light Meter
Separate light-sensor head
Buyer feedback ↓The UT383S separates the light sensor from the screen with a flexible cable. That makes it easier to check a crowded shelf or awkward corner while still seeing the reading.
- 26 × 110 × 53 mmDisplay body · L × H × WSensor separate≈ 0.3 × 1.3 × 0.62 bank-card lengths
- Lux / fcIlluminanceNot direct PAR or PPFD
- Hold + max/minReading controlsBacklit display
Amazon US · Separate light-sensor head · Retailer link
THE QUICK TAKE
Is it right for you?
Choose it for light comparisons in places that are awkward to reach. The separate head can sit near the leaves while you hold the screen outside the canopy. Compare spots under the same fixture with a consistent sensor angle.
Choose another meter if you need direct PPFD or automatic phone logging. This model measures lux or foot-candles and uses local display controls. It also is not a device to leave in a constantly wet cabinet.
01 / BUYING NOTES
Before you buy.
Separate the reading from the reach.
Position the sensor where you want the measurement and keep the display somewhere easy to read. Avoid shading the sensing head with your hand or the meter body.
Expose the white sensing dome.
Remove the protective cover and keep the sensor angle consistent between comparisons. Lux readings under different lamp spectra are not a universal measure of plant-usable light.
Hold a number before moving.
Use HOLD to freeze the current reading or MODE to inspect maximum and minimum values. The LUX/FC button changes the unit; it does not convert the measurement to PPFD.
UT383S specifications ↗ · UT383S operating manual ↗ · Exact US model ↗ · Bluetooth alternative ↗
02 / AMAZON REVIEWS
The buyers’ view.
A reviewer found it useful for comparing photography lights without repeatedly looking through the camera. Experiences with readings were mixed: one described quick, consistent results, while others reported fluctuating readings. Another appreciated the backlight and tethered sensor cover but missed a pocket clip; a buyer expecting a photography meter found the instructions unclear.
Amazon US · Checked . Ratings may include other colors and sizes.
View source ↗03 / SOURCES
What the sources say.
The UT383S pairs a split probe with a backlit screen, maximum/minimum display and data hold. It is designed for illuminance readings rather than direct plant photon measurement.
The manual distinguishes short-press data hold from the backlight control and shows the protective sensor cover. It specifies indoor operation and avoiding high humidity rather than leaving the meter in a wet enclosure.
04 / COMPARE
Different priorities.
Choose the tradeoff that fits how you will use it.
Swipe to see every alternative →
THIS GUIDEUNI-T UT383S Light MeterUT383S · remote head |  ALTERNATIVEUNI-T UT383BT Light MeterUT383BT · Bluetooth | |
|---|---|---|
| Amazon price | $38.99 | $35.99 |
| Best for | A sensor positioned away from the screen | Recording readings through a phone app |
| Design | Wired remote sensing head | Attached sensing head; Bluetooth |
| Use | Keep angle consistent and cover sensor after use | UNI-T iENV app connection |
| Consider | No phone logging or direct PPFD | Harder to place the head independently |
| Explore | Read buying guide →Amazon source ↗ | Read buying guide →Amazon source ↗ |
About these everyday comparisons
Approximate comparisons to familiar objects: a bank card’s 3.37-inch long edge, a Letter sheet’s 11-inch long edge, or a US nickel’s 21.21 mm diameter / 5 g weight. Water comparisons exclude the container’s weight. Capacity comparisons describe volume, not exterior size or how food fits. Reference pictures identify the object; use the labeled ratio for the comparison.
05 / PRICE HISTORY
The price over time.
UNI-T UT383S Light Meter · Separate light-sensor head · Amazon US
The chart legend identifies Amazon and new-offer prices when available. New offers can include marketplace sellers. Coupons, shipping and size/color selections can change the final price. Blank periods are missing observations, not a zero price.
06 / RELATED FINDS
A few useful extras.
For the way you plan to use it.
Adjust a shelf’s lighting
AC Infinity IONBEAM S11
Dimmable light bars let you change placement and output, then compare the readings at the same leaf positions.
Track temperature and humidity separately
SwitchBot Meter Plus
A separate environmental display adds the two growing-condition readings this light meter does not provide.