| Model | MS400-S | 
		
			| Measuring range | Depends on site environment and user requirements | 
		
			| Resolution | 0.001ppm (0-10ppm high precision) / 0.01ppm (0~10 ppm); 0.01ppm (0~100 ppm), 0.1ppm (0~1000 ppm), 1ppm (0~ 1 000 ppm or more); 0.1%LEL; 0.1 %, 0.01 % Vol | 
		
			| Unit Display | Optional units: umol/mol, ppm, pphm, ppb, mg/m3, ug/m3, % Vol, %LEL | 
		
			| Response time | T90≤ 2 0 seconds ( general purpose ) | 
		
			| Working power supply | DC 7.4V | 
		
			| Display Mode | 2.31 inch color LCD | 
		
			| Service environment | -20 ℃~+ 50 ℃, can be customized -40 ℃ ~+70℃ ; Relative humidity: 10-95 % RH | 
		
			| Communication interface | Standard Type-C (full charge in 4 hours) | 
		
			| Data storage | Standard capacity is greater than 200, 000 records ; supports local viewing, deletion or data export, and storage time interval can be set arbitrarily | 
		
			| Interface language | Record the calibration log, maintenance log, fault record, sensor life expiration reminder, and the next concentration calibration time reminder function | 
		
			| Interface language | Chinese, English and other languages can be customized | 
		
			| Explosion-proof type | Intrinsically safe ExiaⅡCT4Ga | 
		
			| levels of protection | IP68 | 
		
			| Shell material | High-strength, corrosion-resistant and fire-resistant polycarbonate and integrated TPE protective cover, anti-fall, wear-resistant and anti-static, effective against drops ≥ 3 meters | 
		
			| Dimensions | Maximum size 148 × 85 × 50 mm (L×W×H) shell size, excluding back clip thickness | 
		
			| Detection method | Built-in pump suction + diffusion | 
		
			| Repeatability | ≤± 2 % | 
		
			| Battery capacity | 7.4V, 3000mA h rechargeable polymer battery with overcharge, over discharge, over voltage, short circuit and overheat protection functions | 
		
			| weight | About 280g |