Our HT602A sound level meter is designed to the needs of the average consumer, with the functions most users need while eliminating unnecessary functions. A 3-in-1 noise meter with sound level, temperature, and humidity measurement functions, which can meet most of the consumers' needs. ?Digital Decibel Meter?This digital decibel meter is a great tool for checking or monitoring the sound level of any environments. It is widely applicable for personal, families, classroom, business, studies, industrial and etc. It is compact and easy to use while providing you an accurate readings in a greater range than normal digital sound meters on the market. Equipped with polarized capacitance type microphone, safe to use. ?A Frequency Weighting Modes?This model only supports A frequency weighting measurement, and it does not support C frequency weighting measurement. A Weighting is commonly used for environmental and convervation program such as OSHA regulatio testing and noise ordinance law enforcement. The test range is 30-130 dBA. It is the ideal tool to discover if something at your workplace or in your neighborhood is too loud, potentially causing hearing damage. ?Practical Functions?The sound pressure level (SPL) meter, large LCD Display backlight give extended visibility suited to any ambient brightness. Supports Max/Min, Data Hold, Fast/Slow Time Weighting functions. Automatic power off if there is no operation within 10 minutes. A storage bag is provided to store the digital decibel meter conveniently. This decibel meter measures range from 30-130 dBA with frequency range from 30hz to 8Khz. Highly accurate with Max1.5dB. ?Wide Application?This portable decibel meter is lightweight and compact, enough to fit in your pocket. It is ideal for classroom, home theater, bar, neighbor noise complaints, outdoor, work or in daily life. Easy to balance the outputs of your home theater speakers, not just by ear. Measure how quietly your air conditioning runs, or sound levels of home appliances. Or take this meter to a store to compare the noise level of appliances or air conditioners before purchasing. ?Reliable Customer Service Warranty?Out of the box you can rest assured of the digital sound meter and just enjoy 3-Year Warranty provided by Intendvision. Power by 3x1.5V AAA batteries. If you have any questions, please contact us through Amazon internal information. We attach great importance to the buyer experience and will solve the problem for you in a timely manner. Ambient Temperature Testing: -20.0C ~ 60.0C ( -4.0F ~ 140.0F ) [3.0C / 6.0F]. Ambient Humidity Testing: 0.0% ~ 99.9%RH [6.0%RH]