The UNI-T UT333 is a digital temperature and humidity meter designed to accurately measure environmental conditions. The device will be suitable for both home and professional use - for example in warehouses, offices, greenhouses, server rooms, laboratories, etc. The UT333 measures temperature from -10°C to 60°C and humidity from 0% to 100% RH with an accuracy of ±1°C and ±5% RH, making the device accurate in most everyday applications. The device's compact design, low weight (102 g) and backlit display make it handy and comfortable to use even in dimly lit rooms.
The meter can measure temperatures from -10°C to 60°C (or 14°F to 140°F) with a resolution of 0.1°C/0.2°F and an accuracy of ±1.0°C/±2.0°F. Humidity measurement covers the entire range from 0% to 100% RH with a resolution of 0.1% RH and an accuracy of ±5% RH. These are sufficiently precise parameters for the effective regulation of the climatic conditions in the environment of rooms or equipment.
The UT333 offers useful functions: MAX/MIN modes allow you to monitor extreme measurement values, Data Hold keeps the current result on the screen, and the °C/°F switch makes it easy to customize the device. The built-in overload (OL) alarm protects against incorrect measurements, and the backlit LCD screen enables operation even in low light conditions.
The measuring instrument works with 3 AAA (R03) batteries, its light weight - only 102 grams - and compact dimensions (155 × 50 × 28 mm) make the device comfortable to hold in the hand and easily fit in a bag, drawer or pocket. The automatic shut-off function after 5 minutes of inactivity helps you save energy, and the low-battery display (3.0-3.5V) lets you know when it's time to replace it with a new one.

- Model UT333
- Temperature measurement range -10°C to 60°C / 14°F to 140°F
- Humidity measurement range between 0% RH and 100% RH
- Measurement accuracy Temperature: ±1.0°C / ±2.0°F; humidity: ±5% RH
- Resolution Temperature: Humidity: 0.1% RH
- Sampling frequency: 1 measurement per second
- MAX/MIN modes Yes
- Data storage (Data Hold) Yes
- Unit conversion °C/°F Yes
- Overload alarm (OL) Yes
- Display backlight Yes
- Automatic shutdown after 5 minutes Yes
- Low battery indicator Yes
- Power supply 3 × 1.5 V battery (R03/AAA), accessory
- Display size 32 × 26 mm
- Weight 102 g
- Dimensions 155 × 50 × 28 mm