Practical Tool: Lightweight and Compact design. This portable decibel meter is great for home and industry use. It can continuously measure sound level from household appliances, pets of neighbor, city construction, factories, offices, road cars and so on. Accurate Measurement: This sound level meter is calibrated at factory before shipping. Measuring range is 30dB to 130dB. Accuracy is 1.5dB with 0.1dBA resolution. Multi-functional SPL: Including all necessary functions, such as Data Hold, MAX and MIN date display. Backlit feature allows use of this meter in the dark. Without operation, device will auto power off after 10 minutes. Fast & Slow Measurement: Fast measurement is suitable for general environmental measurement, response rate 0.125s/time; Slow measurement is suitable for ambient that with large changes in sound level, response rate 1s/time. Back Stand & Carrying Pouch: With Back stand, it can be placed on desktop to get readings conveniently. 2 AAA batteries and black carrying pouch come with the package. This sound meter is great for monitoring noise level in homes, apartments, factories, workshops, schools, offices, theaters and so on. Specifications Frequency Weighting: A Measuring Range: 30-130dBA Resolution: 0.1 dB Accuracy: 1.5 dB Frequency Range: 31.5 Hz ~ 8.5 kHz Time Weighting: Fast/Slow LCD Size: 36x33 mm(1.4x1.3 in) Microphone: 1/2 inch condenser microphone Auto Shut Off: 10 minutes later(without operation) Power Supply: 2 AAA batteries(not included) Dimensions: 205 (L) x 55 (W) x 30 (H) mm (8.0 x 2.2 x 1.2 inch) Weight: approx. 98 g/ 0.22 Ib Packing List 1 x Sound level meter 2 x AAA batteries 1 x Operation Manual 1 x Portable Pouch Please Attention 1) Do not use the meter in a high temperature or humidity environment. 2) Please take out batteries if it not be used for a long time.