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 Air Quality CO2 Meter with Datalogger | CO2 0-5000 ppm, NDIR, temp, humidity, dew point, wet bulb, 99-record logger, backlit LCD, 4 AA, case

Product ID: 10335593

💾99-record datalogger

📊Advanced NDIR CO₂ sensor

🌡️Multi-parameter sensing

S$414

Duties & taxes included

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Description

🌬️ Breathe smarter, work safer — your indoor air quality ally!

PORTABLE POWERHOUSE - Compact, lightweight design with a large backlit LCD and intuitive keypad—perfect for on-the-go professionals.
DATA DRIVEN DECISIONS - Store and review up to 99 data sets to identify trends and ensure workplace safety compliance.
PRECISION CO₂ TRACKING - Stay ahead with accurate 0-5000 ppm CO₂ readings using cutting-edge NDIR technology.
VERSATILE APPLICATION READY - Ideal for offices, classrooms, labs, and HVAC inspections where air quality matters most.
COMPREHENSIVE ENVIRONMENTAL INSIGHT - Simultaneously monitor temperature, humidity, dew point, and wet bulb for full indoor air quality clarity.

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 readings for trend analysis. Designed for professionals, it offers a large backlit LCD, user-friendly interface, and comes complete with data acquisition software, batteries, and carrying case—perfect for ensuring optimal air quality in diverse environments.

Specifications

ASIN	B0029V2GB4
Batteries	4 AA batteries required. (included)
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Best Sellers Rank	#230,007 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #288 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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