UT305C+ - Thermometer Uni-T - Free user manual and instructions
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| Product Type | Non-Contact Infrared Thermometer |
| Model | UT305C+ |
| Brand | Uni-T |
| Temperature Range | -50°C to 380°C (-58°F to 716°F) |
| Accuracy | ±1.5°C or ±1.5% of reading (whichever is greater) |
| Resolution | 0.1°C / 0.1°F |
| Distance to Spot Ratio | 12:1 |
| Response Time | <500ms |
| Emissivity | Adjustable, default 0.95 (range 0.10 to 1.00) |
| Laser Targeting | Class II laser pointer (<1mW, 630-670nm) |
| Display | Backlit LCD with hold function |
| Functions | Max/Min, Auto Power Off (approx. 15s), Data Hold, °C/°F switch, Low Battery Indicator, Laser On/Off |
| Power Supply | 1 × 9V battery (6F22 or equivalent) |
| Battery Life | Approximately 12 hours continuous use (with laser off) |
| Dimensions | Approx. 108 × 50 × 155 mm (4.3 × 2.0 × 6.1 in) |
| Weight | Approx. 150 g (5.3 oz) including battery |
| Operating Environment | 0°C to 50°C (32°F to 122°F), <85% RH non-condensing |
| Storage Conditions | -20°C to 60°C (-4°F to 140°F), <80% RH non-condensing |
| Safety Certifications | CE, RoHS |
| Cleaning | Wipe with a soft, dry cloth. Do not use solvents or abrasive cleaners. |
| Spare Parts & Reparability | No user-serviceable parts except battery. Refer to qualified service for repairs. |
| General Information | This device is intended for industrial and household use. Do not use for medical purposes. Avoid exposure to high temperatures or direct sunlight when not in use. |
Frequently Asked Questions - UT305C+ Uni-T
How do I change the temperature unit from °C to °F?
Press the °C/°F button (usually located on the side or front) to toggle between Celsius and Fahrenheit.
What is the correct emissivity setting for measuring different materials?
Most non-reflective surfaces have an emissivity close to 0.95. Use the table in the manual or refer to standard emissivity values: 0.95 for most organic materials, 0.30 for shiny metals, 0.85 for oxidized metals. Adjust the emissivity setting accordingly.
How do I use the laser pointer?
Press the laser button to turn the laser on/off. The laser helps aim at the target. Avoid pointing it at eyes or reflective surfaces.
Why is my thermometer reading high or low?
Ensure the emissivity is set correctly for the material. Also check that the target area is within the spot size (12:1 ratio). Distance too far or shiny surfaces can cause errors. Allow the thermometer to stabilize for a few seconds.
How do I replace the battery?
Slide the battery cover off at the bottom of the handle. Remove the old 9V battery and insert a new one, matching the polarity. Replace the cover.
What is the maximum distance I can measure?
The distance-to-spot ratio is 12:1. For example, at 12 inches (30 cm) distance, the measurement spot size is 1 inch (2.5 cm). The maximum recommended distance is limited by the required spot size and accuracy.
Can I measure through glass or plastic?
No. Infrared thermometers measure surface temperature only. Glass and transparent plastics may distort or block the infrared signal. Remove barriers or aim at the surface directly.
How do I clean the thermometer?
Wipe the lens and body with a soft, lint-free cloth. If needed, lightly dampen the cloth with water or mild soap. Do not use alcohol, solvents, or abrasive materials.
What does 'OL' or 'Err' on the display mean?
'OL' indicates the temperature is outside the measurement range. 'Err' may indicate a sensor fault or ambient temperature change. Move to a stable environment and restart the device.
How do I reset the thermometer to factory settings?
Remove the battery, wait 10 seconds, and reinsert. This will reset the device. Any custom settings (emissivity, units) will revert to defaults (emissivity 0.95, °C).
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USER MANUAL UT305C+ Uni-T
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Product information
Brand : Uni-T
Model : UT305C+
Category : Thermometer