UNI-T A25M PM2.5 Air Quality Monitor

From the shop's description

UNI-T A25M PM2.5 Air Quality Monitor The UNI-T A25M is a handheld, portable meter built to continuously monitor fine particulate matter (PM2.5) in the air. It has a compact, ergonomic design, making it easy to carry or move between rooms. The display shows PM2.5 concentration levels and ambient temperature, and uses visual cues to help users quickly interpret air quality. The device is powered by a built-in rechargeable battery, so it can be used without a fixed power source for a while, suitable for mobile or spot measurements. When the PM2.5 concentration rises above a certain threshold, the A25M triggers a red backlight alarm to draw attention. There is also a regular backlight so readings are legible in dim conditions. The monitor uses emoticons (“faces”) to provide a quick visual sense of how good or bad air quality is, so that even without reading numbers one gets an intuitive sense of safety or danger. Temperature readings are available, typically in °C or °F, to give context to conditions. Though discontinued now, the A25M was targeted at indoor users who want to know air quality in homes, cars, offices, schools, or public spaces. It offers settings such as automatic power off to save battery when idle, and low battery indication so the user isn’t caught unaware. It is intended for frequent, everyday environmental awareness rather than industrial-level continuous monitoring. Its size and functions make it suitable for non-expert users who want simple, meaningful feedback on air quality. Features: Automatic baseline correction Audible and visual alarm Low battery indication Auto power off Backlight Specifications: Specifications Range A25M PM2.5 (ug/m³) 0~100 ±(10ug/m³+10dgts) 101~400 ±(10%+30dgts) 401~500 ±(10%+50dgts) Temperature (℃) 0~2mg/m³ For reference only Temperature (℉) 0~2mg/m³ For reference only Features Auto power off √ Low battery indication √ Red backlight alarm √ LCD backlight √ Concentration emoticon √ General Characteristics Power A25M: 520mAh rechargeable polymer battery; A25D: 1500mAh rechargeable polymer battery Display A25M: 35mm x 35mm; A25D: 42mm x 65mm Product color White and grey Product net weight A25M: 85g; A25D: 230g Product size A25M: 64mm x 60mm x 28mm; A25D: 75mm x 55mm x 130mm Applications: Homes / residential indoor monitoring Offices and workplaces Schools / educational institutions Hotels Hospitals / clinics Public places (restaurants, shopping malls, airports) Vehicles (cars) Package Contents: 1x Device A25M 1x USB cable 1x Wall mount / wall bracket 1x Car holder Documents: Datasheet User Manual