Does it data logging? If so, how can the data is recovered?

Built-in RS-232 interface for capturing readings on PC * Data acquisition software and cable included to record and document CO2, Humidity and Temperature data

Does it come with certificate of calibration?

The standard calibration price is $195. and the option is NIST Certificate. this will add 1 week to your order.

If one does not pay to have it calibrated as in the other answer, how does the meter establish a baseline?

Turn it on outside for baseline readings.

Can it be calibrated at a later date?

Thank you for your question. The calibration for new item is made by the manufacturer, so it is not possible to set up the later date.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Extech CO250 Portable Indoor Air Quality CO2 Meter with Datalogger - Carbon Dioxide, Temperature, Humidity, Dew Point, Wet Bulb, NDIR Sensor, 99 Record Storage, Large LCD Display

Extech CO250 Portable Indoor Air Quality CO2 Meter with Datalogger - Carbon Dioxide, Temperature, Humidity, Dew Point, Wet Bulb, NDIR Sensor, 99 Record Storage, Large LCD Display

Product ID: 10335593

📊99-record datalogger

🔋4 AA battery powered

🌡️Multi-parameter sensing

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฿27773

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Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌬️ Breathe smarter, work better — your indoor air quality sidekick!

READY FOR ANY SPACE - Ideal for offices, classrooms, labs, and HVAC inspections where air quality is mission-critical.
PORTABLE INTUITIVE - Compact handheld design with large backlit LCD and easy keypad ensures effortless use on the go.
DATA DRIVEN DECISIONS - Stores up to 99 records with built-in datalogger, perfect for trend analysis and compliance reporting.
PRECISION CO₂ TRACKING - Advanced NDIR sensor delivers accurate readings from 0 to 5,000 ppm for confident indoor air quality management.
COMPREHENSIVE ENVIRONMENTAL INSIGHT - Simultaneously monitors temperature, humidity, dew point, and wet bulb to give a full picture of your indoor climate.

The Extech CO250 is a portable indoor air quality meter featuring an advanced NDIR sensor for precise CO₂ measurement up to 5,000 ppm. It simultaneously tracks temperature, humidity, dew point, and wet bulb, storing up to 99 data records for detailed environmental analysis. Powered by 4 AA batteries and equipped with a large backlit LCD, it’s designed for professionals needing reliable, on-the-go air quality monitoring across diverse indoor settings.

Specifications

ASIN	B0029V2GB4
Batteries	4 AA batteries required. (included)
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Best Sellers Rank	#119,196 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #147 in Indoor Air Quality Meters
Color	Black
Customer Reviews	3.8 3.8 out of 5 stars (18)
Date First Available	May 14, 2009
Included Components	Unit^Instruction Guide
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	6.7 ounces
Item model number	CO250
Manufacturer	Extech
Number Of Pieces	1
Part Number	CO250
Product Dimensions	2.76 x 2.24 x 7.87 inches
Style	CO250
Warranty Description	1 year

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