What are the non-mandatory reference ratings for CO2 levels?

350-400ppm (outdoor air), 400-1000ppm (well-ventilated), 1000-2000ppm (inadequate/sleepy), 2000-5000ppm (stagnant/headache), >5000ppm (severe hypoxia/danger).

Tvoc Monitors

Name: Indoor Air Quality Gas Analyzer Measures Pm2.5 Concentration CO2/Hcho/Tvoc Monitors
Brand: Shenzhen Langdeli Technology Co., Ltd.
SKU: 2105231635

Guangdong, ChinaShenzhen Langdeli Technology Co., Ltd.

US$55.00

2-99 Pieces

US$53.00

100-499 Pieces

US$50.00

500+ Pieces

Sample price:US$55.00/piece.Request sample

Product profile

Customization

Available

After-sales Service

1 Year

Warranty

1 Year

Model NO.

DM155C

Brand

Dienmern

Customized

Portable

Desktop / Wall Mounted

Certification

CE, RoHS

Gas

CO2/Pm2.5/Pm10/Hcho/Tvoc/Aqi/Temp/Hum

Type

Desktop / Wall Mounted Gas Detector

Product Name

Air Quality Tester

Detecting Gas

CO2/Pm2.5/Pm10/Hcho/Tvoc

Power Supply

Rechargeable Lithium Battery

Certificate

CE RoHS

Application

Home Office

Color

White

Sensor Type of CO2

Ndir

Sensor Type of Pm2.5

Laser

Display

LCD Display Screen

Material

ABS

Transport Package

Neutral Package

Specification

240*120*24mm

Origin

Shenzhen, China

HS Code

9027100090

Key features

Multi-Gas Detection: Measures CO2, PM2.5, PM10, HCHO, TVOC, AQI, Temperature, and Humidity simultaneously.

NDIR & Laser Sensors: Uses Infrared (NDIR) for CO2 and Laser Scattering for PM2.5 for accurate readings.

Customization Support: Supports custom logo printing, packaging, manuals, stickers, and software settings.

CE & RoHS Certified: Products passed CE, RoHS, MSDS, and UN38.3 certifications for global safety standards.

Portable Design: Compact desktop or wall-mounted unit made of durable ABS material.

Rechargeable Battery: Powered by rechargeable lithium battery with included Type-C charging cable.

1-Year Warranty: Comes with a 1-year warranty covering mechanical defects and parts.

OEM Services: Professional manufacturer offering OEM design and private label services.

Company profile

Shenzhen Langdeli Technology Co., Ltd.

Guangdong, China

Business Type: Manufacturer/FactoryExport Year: 2013-05-17Nearest Port: shenzhenAverage Response Time: ≤11.52hTerms of Payment: LC, T/T, D/P, etc.International Commercial Terms(Incoterms): FOB, EXW, CFR, CIF, DAT, FAS, DDP, DAP, CIP, CPT, FCA

AI-Powered supplier vetting

SummaryLangdeli Technology Co., Ltd. is identified as a China-based manufacturer/factory specializing in testing instruments, including air-quality monitors, gas detectors, radiation monitors, and related devices. The supplier reports 10 years of manufacturing experience, its own factory and production facilities, more than 10 production lines, an ISO 9001 management-system certification, and 6–10 R&D engineers and quality-control staff. It also states that its products hold CE, RoHS, PSE, and FCC certifications and that it has invention and utility-model patents. The supplier claims customized solutions, strategic partnerships with large companies, broad institutional and enterprise usage, and sales and after-sales service capabilities. However, the provided information does not establish independent verification of these claims, detailed financial strength, or specific customer names and project outcomes.

Supplier typeThe supplier is explicitly identified as a Manufacturer/Factory and describes itself as a professional testing-instrument manufacturer with its own factory, production workshop, and office buildings. Its stated product scope includes air-quality monitors, gas detectors, radiation monitors, and other testing instruments.

CertificationsThe supplier reports ISO 9001 certification for its management system and states that its products have passed CE, RoHS, PSE, and FCC certifications. These are explicit certification claims, although the provided slices do not include certificate numbers, validity dates, or issuing-body verification.

After-Sales capabilityThe supplier states that it has a comprehensive sales team and channel system capable of quickly responding to customer needs and providing professional pre-sales consultation and after-sales service. The evidence supports the existence of a stated service structure, but does not provide service-level metrics, response times, warranty terms, or repair arrangements.

R&D capabilityThe supplier identifies itself as a high-tech enterprise, reports a professional R&D team, emphasizes technological innovation, and claims multiple invention and utility-model patents. It also reports 6–10 years of combined R&D-engineer experience, providing explicit positive evidence of innovation resources and activity.

Production capacityThe supplier states that it operates its own factory and production workshop, has advanced production equipment, and runs more than 10 production lines. It also reports 6–10 quality-control staff, indicating established production and quality resources, although actual capacity, output, and utilization are not specified.

Customization capabilityThe supplier explicitly states that it provides customized testing-instrument solutions and maintains R&D, production, and sales capabilities for testing instruments. This supports customization capability, but the slices do not specify customization scope, engineering lead times, minimum order quantities, or examples of completed customized products.

Client casesThe supplier reports strategic partnerships with multiple large companies and says its products are used by government agencies, environmental-protection departments, health-supervision departments, food enterprises, and other fields. These statements indicate broad claimed application and customer exposure, but no customer names, order details, or independently verifiable case studies are provided.

Product Q&A

Q:What test indices are included for the air quality monitor?

CO2 (Infrared sensor NDIR), Temperature, and Humidity. Suitable for detecting CO2 concentration in industrial, agricultural, and residential environments.

Q:How to charge the device?

It uses a mini USB port charging line included in standard accessories. We also offer adapters (US, Europe, etc.) for an extra cost.

Q:Do you support OEM or custom orders?

Yes, we support custom logo printing, custom packaging with neutral artwork, custom manuals in multiple languages (English, German, Japanese, etc.), custom stickers (like Amazon FBA UPC), and customized software (changing standard values, logo display, language).

Q:What certificates are included?

The product includes CE and RoHS certifications, as well as MSDS and UN38.3 documentation.

Q:What are the common application fields?

Industrial/agricultural plants, greenhouses, clean rooms, homes, villas, offices, meeting rooms, classrooms, hotels, hospitals, shopping malls, airports, and theaters.