Features Multi Function Environmental Tester: Measure environmental temperature, humidity, altitude, pressure, illumination, and A C weighted decibels. Features data hold, unit switch, backlit color screen, and maximum display. Versatile Usage: Ideal for accurate and non destructive environmental measurements in laboratories, workshops, outdoors, libraries, indoor lighting inspection, moisture detection, altitude testing, noise level analysis in homes, cars, and hospitals. Noise Decibel A C Weighting: Switch between dBA dBC modes for noise measurement, with maximum reading lock function. Measure noise levels from 30 to 130 decibels with accuracy. Position noise receiver properly for optimal results. Accurate Illumination Detection: Measure brightness and light accurately with LX FC switch. Converts light strength to digital display or analog output. Utilizes silicon photodiodes or selenium cells for photoelectric effects. Altitude and Pressure Test: Test altitude, pressure, temperature, and humidity accurately. Allow the device to sit stationary for 5 to 10 minutes for more accurate readings. Built in barometer adjusts atmospheric pressure based on weather conditions. Specification: Item Type: Environment Tester Material: ABS, PVC Display: LCD Screen Charging Voltage: DC 5V Battery: 1 x Lithium ion Battery 400mAh (Built in) Functional Parameter Reference Table: Temperature (℃): Range: -20-60 Resolution: 0.1 Error: ±0.2 Temperature (℉): Range: -4-140 Resolution: 0.1 Error: ±0.2 Humidity (RH): Range: 10%-99% Resolution: 0.1 Error: ±3% Illuminance (LX): Range: 0-199999 Resolution: 0.1 Error: ±5% Illuminance (FC): Range: 0-199.99 Resolution: 0.01 Error: ±5% Altitude (M): Range: -700-9000 Resolution: 0.01 Error: ±0.5 Pressure (hPa): Range: 300-1200 Resolution: 0.01 Error: ±20 Noise (dBA/C): Range: 30-130 Resolution: 0.1 Error: ±5 Illumination Reference Table: 75-30 LX: Warehouse, Garage, Darkroom, Lounge 150-75 LX: Corridor, Toilet, Storage Room, Passage, Guest Room 300-150 LX: Classroom, Hall, Restaurant, Ward, Living Room 750-300 LX: Laboratory, Meeting Room, Kitchen 1500-750 LX: Hallway, Operating Room, Counter, Workshop 3000-1500 LX: Super Accuracy Workshop 10000-300000 LX: Visual Function Examination Room How to Use: Follow the instructions manual after taking out the product. packing list: 1 x Detector 1 x Charging Cable 1 x Manual 1 x Storage Box Note: Please read the instructions carefully before use, familiarize yourself with the operation, parameters, functions, and precautions. Package List 1 x Detector 1 x Charging Cable 1 x Manual 1 x Storage Box