SPECIFICATIONS With LCD Screen Or Not: Yes Gas Type: Multifunctional Histogram Function: Yes Calibration Function: Yes Temperature & Humidity: Yes *The HCHO and CO2 sensor can be re-calibrated by clicking the Menu button > Calibration Zero. Temtop Laser PM2.5 Sensor (Upgraded to 4th-gen.) The particles pass through the professional light source from QSI, combined with the MIE scattering principle and the smart particle inversion algorithm to determine multi-channel concentration of PM2.5, PM10, and TSP. SenseAir NDIR CO2 Sensor Using NDIR (non-dispersive infrared) gas sensing technology, based on the Lambert-Beer absorption law, combined with the built-in CO2 gas fingerprint feature analysis algorithm to determine the concentration of CO2. Dart Electrochemical HCHO Sensor The HCHO gas pass through the electrolyte, combined with the principle of chemical electrode reaction, and a built-in algorithm to convert various electrical signal into the formaldehyde concentration values. 8:1 Design M2000 2nd Generation Air Quality Detector allows you to take a reading of the HCHO + PM2.5 + PM10 + Particles + CO₂ + Temperature + Humidity + Data Export. TFT color LCD screen Wide Application The monitor makes it easy to take measurements from one room to another in order to get an overview of the concentrations of various pollutant in home, workplace, school, a daycare center or any other location. 6 Hours Battery Life Powered by internal 2200 mAh rechargeable lithium batteries,it will run 6 hours continuously without charging, Input voltage: DC 5 V Input current: 1 A Battery Voltage:3.7 VDC Multifunctional Function Suspend/Continue measuring Mute/Unmute the buzzer Display/Not display the curve Alarm setting Zero calibration Exit Handheld M2000 2nd Air Quality Detector M2000 2nd combines ease of use and performance. A simple but powerful air quality detector. The Temtop M2000 2nd Air Quality Detector provides exactly what you need to stay on top of your home air quality levels - no more, no less. Measuring range (PM2.5/PM10):      0~999 ug/m³ Measuring range (HCHO): 0~5 mg/m³ Measuring range (CO₂): 0~5000 PPM Operating environment: Temperature range:      0-50 ℃ / Humidity range: 0-90% RH Specifications     Dimensions 8.8 x 2.8 x 1.4in Battery Capacity 3000mAH Battery Last 6-8h with full charge Input DC 5V; 1A 0peration Environment 0-50℃ (32-122℉), 0-90%RH PM2.5 Measuring Range 0-999 μg/m³ (Resolution 0.1 μg/m³) PM2.5 Accuracy ±10 μg/m³(0-100 μg/m³), ±10%(>100 μg/m³) PM10 Measuring Range 0-999 μg/m³ (Resolution 0.1 μg/m³) PM10 Accuracy ±15 μg/m³(0-100 μg/m³), ±15%(>100 μg/m³) CO2 Measuring Range 0-5000 ppm (Resolution 1 ppm) CO2 Accuracy ±50 ppm + 5% reading HCHO Measuring Range 0-2 mg/m³ (Resolution 0.001 mg/m³) HCHO Accuracy ±0.03 mg/m³(0-0.3 mg/m³), ±10%(>0.3 mg/m³) LKC-1000S+ 2nd M2000 2nd PM2.5&PM10 ✓ ✓ HCHO(formaldehyde) ✓ ✓ CO₂ ✓ AQI ✓ TVOC ✓ Histogram ✓ ✓ T&H ✓ ✓ Backstand ✓ Audible Alarm ✓ Data Export ✓ ✓