4-in-1 CO Combustible Gas Checker Plug-In Air Quality Tester with Temperature Humidity Display Digital Screen Detachable Adapter Backup Batte

4-in-1 CO Combustible Gas Checker Plug-In Air Quality Tester with Temperature Humidity Display Digital Screen Detachable Adapter Backup Batte 4-in-1 Air Quality Check – Simultaneously measures carbon monoxide (CO) concentration (0-2000ppm), combustible gas level (0-10% LEL), temperature (1-176°F), and humidity (0-99% RH). One compact device offers comprehensive indoor air awareness. Fast & Clear Readout – Values refresh every 2 seconds on a bright digital display, allowing you to view current air conditions at a glance. The display also shows alarm status with intuitive LED indicators. Plug-In with Detachable Adapter – Powered by AC 100-220V, the device easily plugs into any standard outlet. The detachable adapter structure adds portability, making it convenient for use at home, in an RV, garage, kitchen, hotel, or classroom. Reliable Alarm & Self-Test – When CO reaches 150ppm or combustible gas reaches 5% LEL, the red light flashes and an audible alarm sounds. A self-test button verifies the alarm function is working properly. Preheating countdown ensures stable readings. Backup Battery for Continuous Protection – Equipped with a DC 9V alkaline battery (pre-installed), the unit automatically switches to battery power during AC outages, providing over 4 hours of operation to keep checking without interruption. Key Features：4-in-1 Air Quality Check – Simultaneously measures carbon monoxide (CO) concentration (0-2000ppm), combustible gas level (0-10% LEL), temperature (1-176°F), and humidity (0-99% RH). One compact device offers comprehensive indoor air awareness. Fast & Clear Readout – Values refresh every 2 seconds on a bright digital display, allowing you to view current air conditions at a glance. The display also shows alarm status with intuitive LED indicators. Plug-In with Detachable Adapter – Powered by AC 100-220V, the device easily plugs into any standard outlet. The detachable adapter structure adds portability, making it convenient for use at home, in an RV, garage, kitchen, hotel, or classroom. Reliable Alarm & Self-Test – When CO reaches 150ppm or combustible gas reaches 5% LEL, the red light flashes and an audible alarm sounds. A self-test button verifies the alarm function is working properly. Preheating countdown ensures stable readings. Backup Battery for Continuous Protection – Equipped with a DC 9V alkaline battery (pre-installed), the unit automatically switches to battery power during AC outages, providing over 4 hours of operation to keep checking without interruption.

Specifications：Supply Voltage: AC 110-220V Static Power Consumption: ≤2W Alarm Power Consumption: ≤3W CO Measurement Range: 0 – 2000 ppm CO Alarm Concentration: 150 ppm Combustible Gas Measurement Range: 0 – 10% LEL Combustible Gas Alarm Concentration: 5% LEL Temperature Display Range: 1 – 176°F (±4°F) Humidity Display Range: 0 – 99% RH (±5%) Preheating Countdown: 180 seconds Alarm Indication: Green light steady (normal), Yellow light off, Red light flashing with audible alarm Self-Test: Press button to flash red light and sound alarm Backup Battery: DC 9V alkaline battery (included), provides >4 hours runtime during power failure Operating Environment: -10°C to +55°C (14°F to 131°F), relative humidity ≤95% Storage Environment: -25°C to +55°C (-13°F to 131°F), relative humidity ≤95% Dimensions: 89 × 85 × 60 mm (3.5 × 3.3 × 2.4 in) Weight: Lightweight, portable design Package Contents：1 × 4-in-1 CO & Combustible Gas Checker (with pre-installed DC 9V backup battery) 1 × Detachable Plug Adapter 1 × User Manual