382400 - Environmental Thermometer Extech - Free user manual and instructions
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| Product type | Environmental Thermometer |
| Manufacturer | Extech |
| Model | 382400 |
| Measurement parameters | Temperature, Relative Humidity, Dew Point, Wet Bulb |
| Temperature range | -20 to 60°C (-4 to 140°F) |
| Humidity range | 0 to 100% RH |
| Display | Backlit LCD with simultaneous reading |
| Data hold | Freezes displayed value |
| Min/Max/Average | Records minimum, maximum, and average readings |
| Auto power off | After approximately 10 minutes of inactivity |
| Battery | One 9V battery, low battery indicator |
| Dimensions | 180 × 65 × 40 mm (7.1 × 2.6 × 1.6 in) |
| Weight | 190 g (6.7 oz) including battery |
| Operating environment | 0 to 50°C (32 to 122°F), 0 to 95% RH non-condensing |
| Storage instructions | Store in a dry, clean place away from direct sunlight |
| Cleaning | Wipe the housing with a soft, damp cloth |
| Repair and spare parts | No user-serviceable parts inside; contact qualified technician |
| Compliance | CE, RoHS |
Frequently Asked Questions - 382400 Extech
How do I turn on the Extech 382400?
Press the ON/OFF button to start the device. The display will show the current temperature and relative humidity values. To turn it off, press the same button again.
How do I switch between Celsius and Fahrenheit?
Press and hold the °C/°F button for 2 seconds. The unit will toggle between Celsius and Fahrenheit on the display. The selected unit is shown at the top of the LCD.
What is the difference between temperature, dew point, and wet bulb?
The air temperature is the actual ambient temperature. The dew point is the temperature at which moisture condenses from the air. The wet bulb temperature takes into account evaporation and is lower than the ambient temperature when humidity is low.
How do I replace the battery?
Open the battery compartment on the back of the device using a screwdriver. Replace the 9V battery observing the polarity markings, and close the compartment securely. Do not dispose of old batteries in household waste.
Can I use this thermometer outdoors?
Yes, the device can be used both indoors and outdoors. However, do not expose it to direct sunlight, rain, or extreme temperatures for prolonged periods, as this may affect accuracy and damage the sensor.
How does the DATA HOLD function work?
Press the HOLD button to freeze the current readings on the display. The icon appears to confirm. Press again to release and resume live measurement.
What does MIN/MAX do?
The MIN/MAX key records the lowest and highest readings since this feature was activated. Press once to view the maximum, twice for minimum, and three times to return to normal mode. Average readings are also available.
Why is the backlight not working?
Ensure the battery is sufficiently charged. If the backlight still does not activate, check if the backlight button is pressed. If the problem persists, the LED may be defective; contact customer support.
What is the accuracy of the temperature and humidity sensor?
The typical accuracy is ±1°C (±1.8°F) for temperature and ±3% RH for relative humidity. For precise calibration, refer to the manual's specifications section.
How do I clean the device?
Turn off the device before cleaning. Use a soft, slightly damp cloth to wipe the enclosure and display. Do not use abrasive cleaners or solvents, and never submerge the device in water.
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USER MANUAL 382400 Extech
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Product information
Brand : Extech
Model : 382400
Category : Environmental Thermometer