The 4 in 1 Multi-Function Lux Meterincludes sound sensor, light sensor, temperature sensor and relative humidity. The 4 in 1 Multi-Function Lux Meter combines a noise analyser, a light meter, a thermometer and a relative humidity. The Lux Meteris especially suited to educational settings with the aim of measuring all 4 parameters and can also be used in both a professional setting or at home. The Lux Meter with all its sensors, comes in a light carrying case and is both easy and quick to use. Test environmental conditions directly. - 17mm LCD display with 4 digits - Hold function - Auto OFF to conserve battery power - Battery power inidcator - ABS enclosure - Ships with a noise sensor, light sensor, tempurature sensor, humidity sensor, microphone windscreen, a 9V battery and user' s manual in a solid case. Note: the Lux Meteris for taking orientative measurements. If you wish to take high precision measurements, then you should choose a specific measuring instrument that corresponds to the specific parameters. Technical Specifications Lux Meter Range A/ C Lo ( low) 35 to 100 dB A/ C Hi ( high) 65 to 130 dB Resolution 0.1 dB Frequency range 30 Hz to 10 kHz Frequency weighting A and C Response time quick Accuracy ± 3.5 dB at 94 dB sound level, 1kHz sine wave Microphone Electric condenser microphone Accuracy ± 3% to standard JISdB( A) Light Meter Range 20 / 200 / 2.000 / 20.000 lux ( 20.000 lux range reading x 10) Over-range highest digit of " 1" is displayed ( user adjustable range) Accuracy ± 5% of the reading + 2 digits Repeatability ± 2% Temperature characteristic ± 0.1% / ° C Sensor silicon photodiode with filter Humidity Meter Range 25 to 95% r.h. Resolution 0.1% Accuracy ± 5% Temperature Range -20 to + 200 ° C / -20 to + 750 ° C Resolution 0.1° C / 1° C Accuracy ± 3% reading ± 2° C( -20 to + 200° C) ± 3.5% reading ± 2° C ( -20 to + 750° C) General Details Display 17mm LCD with 4 digits ( maximum indicator: 1999) Display symbols lux, x10lux, ° C, ° F, % H.r., dB, A+ dB, C+ dB, Lo+ dB, Hi+ dB, MAX HOLD, DATA HOLD Over-range only shows " 1" on the display Rate of measurement approx. 1.5 times a second Temperature for data accuracy 23 ° C ± 5° C Operating conditions 0 to + 40° C Storage temperature -10 to + 60° C Power 1 - 9V battery ( PP3) Dimensions of the device 251 x 64 x 40 mm Dimensions of the light sensor 115 x 60 x 27 mm Weight 250 g Delivery contents 1 x PCE-EM882 Multi-Function Lux Meter with sound sensor 1 x light sensor 1 x tempurature sensor 1 x humidity sensor 1 x microphone protector 1 x 9V battery 1 x carrying case 1 x user' s manual