Using the TNm infrared thermometer module is straightforward. First, make sure to select the appropriate operating voltage, either 3V or 5V, according to your needs. Point the module at the object whose temperature you want to measure, within the measurement range of -33°C to 220°C (-27°F to 428°F). The module will then give you an accurate temperature reading. Remember that the module works best within the operating range of -10°C to 50°C (14°F to 122°F). When taking measurements, try to keep the ambient temperature around 25°C for the most accurate results. As for maintenance, keep the module clean and dry. Avoid dropping it or exposing it to extreme conditions. If you have any questions, refer to the user manual that comes with the product.