Are there any gas sensors called "Precalibrated Sensors"

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dear sir,

are there sensor modules called "precalibrated sensors" co,co2 @ market ?
as heard sensors don't want calibrate in known concentration of gas want measure. difficult create known concentration of gases @ home.
so method gas level in ppm range following sensor? sensor data sheet asked resistance known concentration of required gas measure gas in ppm level.

sensor>> http://www.ebay.com/itm/mq-6-lpg-gas-sensor-for-arduino-propane-isobutane-sensor-/130897192673?pt=lh_defaultdomain_0&hash=item1e7a14a6e1

please me school project.

thanks.

this sensor calibrated.
http://www.vernier.com/products/sensors/co2-bta/
it costs 249 dollars.

this 1 costs more 400 euros, http://www.theben.de/de/produkte/klima/sensorik/co2-sensoren/amun-716-r

the more professional or industrial quality want, more have pay.
for home use, think devices measure carbon dioxide between 100 , 200 euros.
but measure other gasses, don't know sure if measuring carbon dioxide.


Arduino Forum > Using Arduino > Sensors > Are there any gas sensors called "Precalibrated Sensors"


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