A CLOSER LOOKTools
Find the darker corners of a growing shelf.
UNI-T UT383BT Light Meter
Bluetooth illuminance meter
Buyer feedback ↓UNI-T’s UT383BT measures illuminance and sends readings to the iENV phone app over Bluetooth. It is useful for comparing positions under the same lights, with a clear limit: lux is not a direct measure of plant-usable photons.
- 28 × 160 × 50 mmMeter size · L × H × W≈ 0.33 × 1.9 × 0.58 bank-card lengths
- Lux / fcIlluminanceNot a PAR or PPFD meter
- BluetoothPhone connectionUNI-T iENV app
Amazon US · Bluetooth illuminance meter · Retailer link
THE QUICK TAKE
Is it right for you?
Buy it to compare shelf positions and record light changes. Move the sensor to leaf height and keep its angle consistent. Bluetooth gives you a way to save the readings instead of writing every number down.
Skip it if you need direct PPFD or a universal lux-to-PPFD conversion. Different light spectra change the relationship. The attached sensor can also be awkward in tight spaces; a remote-head meter is easier to position there.
01 / BUYING NOTES
Before you buy.
Measure where the leaves sit.
Put the sensor at the leaf position and keep its angle consistent. Avoid shading it with your hand or body; otherwise you may be measuring your own shadow.
UT383BT specifications ↗ · iENV app functions ↗ · Exact Amazon model ↗ · Remote-sensor alternative ↗
02 / AMAZON REVIEWS
The buyers’ view.
Buyers report using the meter with the PPFD app, including an owner who found it helpful for mapping light across growing areas. Bluetooth experiences are mixed: another buyer could not detect the meter on their iPhone, iPad or MacBook Pro and reported that the manufacturer's app did not support it.
Amazon US · Checked . Ratings may include other colors and sizes.
View source ↗03 / SOURCES
What the sources say.
The BT model adds Bluetooth and a tripod mounting hole to the compact UT383 design. Its sensing head stays attached to the instrument.
iENV supports live and saved measurements with export options. It is a companion for the meter’s illuminance readings, not a conversion into PAR or a plant-growth diagnosis.
04 / COMPARE
Different priorities.
Choose the tradeoff that fits how you will use it.
Swipe to see every alternative →
THIS GUIDEUNI-T UT383BT Light MeterUT383BT · Bluetooth |  ALTERNATIVEUNI-T UT383S Light MeterUT383S · remote sensor | |
|---|---|---|
| Amazon price | $35.99 | $38.99 |
| Best for | Saving readings to a phone | Positioning the sensor away from the display |
| Design | Attached sensor head | Separate wired sensor head |
| Use | Keep sensor angle and position consistent | Place the head without shading it |
| Consider | Not a PPFD meter | Different handling; check recording needs |
| 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 UT383BT Light Meter · Bluetooth illuminance meter · 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 the light you are checking
AC Infinity IONBEAM S11
Dimmable IONBEAM bars let you change placement and brightness, then compare the result at the leaves.
Track the growing environment
SwitchBot Meter Plus
A temperature and humidity display adds the two environmental readings this lux meter does not provide.