Amprobe CO2-100 Handheld Carbon Dioxide Meter

(14 customer reviews)

  • Low drift portable meter for checking indoor air quality
  • CO2 measurement up to 9999 ppm
  • Triple display with simultaneous CO2, temperature and relative humidity readings
  • Selectable display of dew point and wet bulb
  • Air quality analysis with displays of:
  • TWA display (time-weighted average) for 8 hrs period
  • 15 minutes STEL (short-term exposure limit) value
  • High performance low drift sensor designed with NDIR (non-dispersive infrared) waveguide technology
  • Easy to read large LCD display
  • Manually calibratable
  • Audible alarm threshold setting to setup warning against carbon dioxide level
  • Backlight function for working in dark area
  • Optional PC download capabilities
  • Data hold
  • Maximum, minimum, average functions
  • Long time drift compensation for accurate readings
SKU: 3475094 Category:


Instant feedback with CO2 levels, with additional temperature and humidity measurement. Built in alarm warns against dangerous CO2 levels. The portable CO2-100 Air Quality meter is designed to measure air quality compliance in occupied spaces such as offices, production floors, schools or hospitals.


Feature CO2-100 CO2-200
C02 0 → 9999 ppm 0 → 9999 ppm
Temperature range 14 °F → 140°F (-10 °C → 60 °C ) 14 °F → 140 °F (-10 °C → 60 °C)
RH range 0 % → 95 % 0 % → 95 %
DP (dew point temperature) -4 °F → 139.8 °F (-20 °C → 59.9 °C) -4 °F → 139.8 °F (-20 °C → 59.9 °C)
WB (wet bulb temperature) 24.8 °F → 139.8 °F (-5.0 °C → 59.9 °C) 23 °F → 139.8 °F (-5.0 °C → 59.9 °C)
Resolution 1 ppm – CO2 concentration, 0.1 °C / °F – Temp, 0.1 %RH – humidity 1 ppm – CO2 concentration, 0.1 °C / °F – Temp, 0.1 %RH – humidity
Measuring range: CO2 0 ~ 9999 ppm
5001 ~ 9999 ppm (out of scale range)
Temperature range: -10°C to 60°C (14°F to 140°F)
RH Range: 0% ~ 95%
DP (Dew point temperature): -20°C to 59.9°C (-4°F to 139.8°F)
WB (Wet bulb temperature): -5.0°C to 59.9°C (24.8°F to 139.8°F)
Resolution: 1ppm – CO2 concentration, 0.1°C / °F – Temp, 0.1% RH – humidity
Accuracy: ±30ppm±5% of reading(CO2) (0~5000ppm) others rang accuracy are not specified ; ±0.6°C / ±0.9°F,
±3% RH (at25°C ,10~90%) others ±5% for other RH range
Sensing tech: CO2 -NDIR sensor
Humidity: Rotronic capacitor type
Power supply: AA type (UM-3) x 4 pcs



CO2 Detectors

Find C02 monitors for every application.

What’s Included

  • CO2-100
  • Batteries (installed)
  • Carrying case


Datasheet »
Product Manual »

14 reviews for Amprobe CO2-100 Handheld Carbon Dioxide Meter

  1. trumpetech

    Consistent calibration and fast updating

    I use this tool to check environmental CO2 conditions in theaters and in the field. The range is good with humidity readings that went to 3% in Colorado sub-alpine desert and CO2 readings that topped the 9,999 ppm limit in productions.
    The carrying case is a bit large but made to carry other accessories. I would have liked it to include the 110V transformer. Take the unit when you look for a transformer; it is a smaller DC plug than expected.

    ✔ Yes, I recommend this product.

  2. Dave

    great meter

    very handy for checking class rooms. like having temp,hum,and co2 levels all in one.

    ✔ Yes, I recommend this product.


    Wrong instruction for calibration

    Meter is good, easy to use and reliable. Odd thing is that you can never calibrate the CO2 Sensor if you follow the instruction. Amprobe should check for the mistake and revise the manual.

    ✔ Yes, I recommend this product.

  4. JH215

    great meter

    the simple misprint in the manual is that you must press “^” and “cal” together, not the downward facing arrow for calibration, once you do that it works wonderfully

    ✔ Yes, I recommend this product.

  5. morris3199

    This product is easy to use and read

    While just purchasing my first home with a gas furnace, we had problems with it not working when we moved in. The pilot light wasn’t working properly. Knowing it was gas and worried about the odors being omitted we purchased this tool to keep an eye on it. The ease of using it and understanding what the readouts meant help us be sure that there wasn’t too much bad carbon dioxide in the air.

    ✔ Yes, I recommend this product.

  6. sammy

    Perfect amount of info…

    I love this light weight CO2 meter. Has all the numbers displayed in large on a clear screen. Not too much info on the screen at once. Not many buttons on meter, but all the info necessary for monitoring the IAQ. I wish it had a stand on back of meter so that i can leave it standing in a room on a piece of furniture for 15 min., and not be worried someone in the office will brush the furniture and cause it to fall. I would surely urge anyone in IAQ field to buy this.

    ✔ Yes, I recommend this product.

  7. jaksrw31

    Good features and seemingly durable

    Product is relatively easy to setup and use. I have not tried to calibrate as I expect it’s factory calibration is still solid after only using for a couple of days. Do wish it didn’t take 30 seconds to be ready to use and I have yet to be able to get the unit to power off manually. However, its is great to have not only temp and humidity but Dew point and Wet bulb as well. That is handy. Being able to get an average of all those readings is a definite plus. Good Product all around so far.

    ✔ Yes, I recommend this product.

  8. Consultant

    Easy to use and very accurate.

    Best bang for our buck. Easy to read numbers display with a back up light/illumination. It performed well and is a great addition for any air quality assessment tool kits. We are a consulting company and we are satisfied with this product. In a matter of minutes I was able to calibrate and set alarm parameters easily.

    ✔ Yes, I recommend this product.

  9. Domenic

    Amprobe CO2-100: Common problems as other reviewers

    Meter is easy to use and seems to be accurate when calibrated to ambient conditions; however, I have 3 issues with it and /or Amprobe…

    Issue #1: Power button will not turn off the meter. (I was told this is a non-issue since the meter turns off on it’s own and is not a manufacturing defect.)
    Issue #2: Instructions on calibrating the CO2 to ambient conditions is incorrect in the Users Manual. The “cal” button and the arrow button opposite of what is shown in the manual must be used to put the meter in CO2 calibration mode.
    Issue #3: A customer service representative told me the meter was going to be discontinued in March and that any warranty claims would be resolved with a “new” meter as long as they were in stock. I was told that once the current inventory is gone, they will no longer support the meter.
    With these caveats, I do still recommend this meter because it is very inexpensive as far as CO2 meters are concerned and, for the company I work for, it is considered a “disposable” asset.

    ✔ Yes, I recommend this product.

  10. Geogirl

    Great for high school classroom labs!

    I use the Amprobe CO2-100 in my high school science class. We do a lot of inquiry based labs where students take data inside and outside.

    One project is taking data in different areas–one natural area with real plants, grass, etc, one area that the school has put in fake grass, plants, etc.

    The students enjoy working with the meter and have even borrowed them to take CO2 readings in classrooms where they feel particularly tired, especially when the door is closed.

    ✔ Yes, I recommend this product.

  11. HainPPC

    Not calibrated from factory

    The unit was recieved and was off calibration by 541ppm compared to other units on site. It has not been used in the plant as of this time. Calibratio on this unit does not work as explained in the manual. the unit cannot be turned off during calibration and it only calibrate the humidity. SN – 1702038

    ✘ No, I do not recommend this product

  12. BENZ

    Good Product

    I like this meter and the multiple readings on the same screen. This multiple readings on the same screen make it easy to take multiple readings at the same time without having to switch between screens.

    ✔ Yes, I recommend this product.

  13. ncat1996

    Reliable and Bulky

    The CO2-100 meter is a decent and reliable product. The meter does what it was made to do, provide CO2 readings. It also provides dry bulb temperature and relative humidity readings with wet-bulb and dew point temperatures also of which I really like. The three drawbacks are that the meter is very bulky even for a handheld device. It does not have an off button. And the prescribed on time for the meter is not adjustable. It’s still a good meter that I have used a lot.

    ✔ Yes, I recommend this product.

  14. RogerN

    Poor programming

    The meter “kind of” worked, but could never be properly calibrated without an error message, or running on CAL mode for hours. It seemed to have some programming errors, buttons were often unresponsive, and sometimes locked up. After 3 years, I put in fresh batteries and attempted to calibrate it again; it doesn’t seem to work at all any more.

    ✘ No, I do not recommend this product

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