What is the margin of error on this thing

As long as it reads 300 to 400 outside it gives me confidence that it is fairly accurate. And it Alway has stayed in that margin outside. In a dark room you can see the infa red pulse every few seconds and seam to adjust corispodingly. Hope that helps.

Can this be used outside the US with 220v ?

Yes, absolutely. This device comes with a variety of plugs for many different types of sockets. It also supports 220v, I'm using it in Russia with 220v.

Can this be used at 35 degrees F long term?

Specs show -10 C (14 F) as lowest operating temperature. My Use has been at room temperature.

Does this unit have external sensors?if so how many,am looking for one to use specifically in a Greenhouse.

This unit does not have external sensors, it is however still working great for me. For remote sensing, you may want to look at Lascar brand. I use one of their USB models for remote temp and humidity tracking, I am very happy with it. I know they make some models that track C02 as well.

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CO2Meter AZ-0004 Indoor Air Quality CO2 Meter, Temperature and Relative Humidity, White

CO2Meter AZ-0004 Indoor Air Quality CO2 Meter, Temperature and Relative Humidity, White

Product ID: 1204375

Details

Battery Description
No batteries
Brand
CO2Meter
Color
White
Item Weight
7.05 ounces
Mounting Type
Wall Mount

💧Humidity 20-99.9% RH

💨CO2 range 0-10,000 ppm

🌡️Temp range 0-120°F

Description

🌬️ Breathe smarter, live sharper — your air’s new best friend!

AUDIBLE CO 2 ALERTS - Stay informed with an 80 dB alarm that signals when air quality dips below optimal levels.
DATA DRIVEN WELLNESS - Empower your workspace or home with actionable air quality data proven to boost cognitive function and sleep quality.
SMART SELF CALIBRATION - Maintenance-free with no moving parts, ensuring long-term accuracy and reliability.
PLUG AND PLAY SIMPLICITY - No setup hassle—just plug into any wall socket and start tracking air quality immediately.
REAL TIME AIR QUALITY INSIGHTS - Instantly monitor CO2, temperature, and humidity for a healthier environment.

The CO2Meter AZ-0004 is a professional-grade indoor air quality monitor that continuously measures carbon dioxide levels (0-10,000 ppm), temperature (0-120°F), and relative humidity (20-99.9%). Designed for plug-and-play use with self-calibrating technology and no batteries required, it features a clear display with clock, calendar, and an 80 dB audible alarm to alert you when air quality is poor. Ideal for homes, offices, and commercial spaces, it empowers users to optimize ventilation and improve health, cognitive performance, and sleep quality.

Specifications

ASIN	B001PDGFR8
Battery Description	No batteries needed
Best Sellers Rank	#934,378 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1,005 in Indoor Air Quality Meters
Brand Name	CO2Meter
Color	White
Customer Reviews	4.4 4.4 out of 5 stars (377)
Global Trade Identification Number	08809229610029
Included Components	110/240 VAC International Wall Adapter User’s Manual
Item Length	4.72 inches
Item Weight	7.05 ounces
Manufacturer	AZ Instruments
Model	7Z-RWZ2-K2NX
Mounting Type	Wall Mount
Operating Humidity	20-99.9%
Part Number	AZ-0004
Temperature Accuracy	0.5
UPC	040232371400 855175007114
Unit Count	1 Count
Upper Temperature Range	120 °F
Voltage	110 volts

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