Feature: 1. HIGH-SENSITIVITY SENSOR: High-precision semiconductor sensor with low power consumption, fast response time, strong anti-interference capability, more accurate data collection, and long service life. 2. SENSITIVITY SELECTION: Pressing the Hi button displays \"SH\" on the screen, indicating high sensitivity mode; Pressing the Lo button displays \"SL\" on the screen, indicating low sensitivity mode. 3. DUAL ALARM PROMPTS: When the instrument detects combustible gas, the built-in buzzer emits a sound alarm, the display screen shows red backlight, and the concentration analog bar increases. 4. AUTOMATIC SHUTDOWN: The instrument will automatically shut down within about 5 minutes after startup without measurement signal or button operation. 5. LCD DISPLAY SCREEN: In dark environments, the data is clear and visible, making it easy to understand the current working status of the instrument. Specification: Features: HIGH-SENSITIVITY SENSOR: High-precision semiconductor sensor with low power consumption, fast response time, strong anti-interference capability, more accurate data collection, and long service life. SENSITIVITY SELECTION: Pressing the Hi button displays "SH" on the screen, indicating high sensitivity mode; Pressing the Lo button displays "SL" on the screen, indicating low sensitivity mode. DUAL ALARM PROMPTS: When the instrument detects combustible gas, the built-in buzzer emits a sound alarm, the display screen shows red backlight, and the concentration analog bar increases. AUTOMATIC SHUTDOWN: The instrument will automatically shut down within about 5 minutes after startup without measurement signal or button operation. LCD DISPLAY SCREEN: In dark environments, the data is clear and visible, making it easy to understand the current working status of the instrument. Specifications: Model: HT61L Material: ABS Combustible Gas Detection: 1%LEL(100PPM)~10%LEL(5000PPM) (methane) Accuracy: ±30% Display: LED Auto Power Off: Yes Low Battery Indication: Yes Buzzer Alert: Yes Power Supply: 2 * 1.5V AAA Alkaline batteries (Not included) Safety Rating: EN61326-1 Item Size: 315 * 32 * 31mm / 12.40 * 1.25 * 1.22in Item Weight: 66g / 2.32oz Package Weight: 165g / 5.82oz Package Size: 35 * 5.5 * 3.5cm / 13.78 * 2.16 * 1.37in Package List: 1 * HT61L Gas Leak Detector 1 * Storage Bag 1 * User Manual (English) Package List: Package List: 1 * HT61L Gas Leak Detector 1 * Storage Bag 1 * User Manual (English)