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KLEIN TOOLS

Klein Tools ET110 CO Meter, Carbon Monoxide Tester and Detector with Exposure Limit Alarm, 4 x AAA Batteries and Carry Pouch Included

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Features

  • ACCURATE CO GAS MEASUREMENT: Detect and measure carbon monoxide gas levels with precision using our easy-to-use CO meter
  • PORTABLE AND PROTECTIVE: Carry our CO detector anywhere for user safety, with a built-in short-term exposure limit (STEL) alarm
  • DUAL ALARM SYSTEM: Stay informed about CO levels with both low (35 ppm) and high (200 ppm) level alarms, ensuring prompt action
  • AUDIBLE AND VISUAL ALERTS: Receive immediate warnings through audible and visual alarms, providing increased safety and peace of mind
  • CLEAR DISPLAY: Backlit display shows CO measurements (0 to 1000 ppm) and temperature (Fahrenheit and Celsius) for easy reading
  • BATTERY SAVING FEATURE: Auto-power off after 20 minutes of inactivity helps conserve battery life, extending the device's usability
  • CONVENIENT PACKAGE: Includes a carrying pouch and 4xAAA batteries, making it easy to transport and operate the CO meter efficiently

Description

The ET110 CO Detector is an easy-to-use meter that detects and measures concentration levels of carbon monoxide (ppm) and temperature (Fahrenheit/Celsius), making it the perfect choice for HVAC professionals. Features backlit LCD screen, warning indicator light, audible and visual alarms and multiple function buttons. Includes carrying pouch and 4 x AAA batteries. For more than 160 years, Klein Tools has manufactured premium- quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.

Brand: KLEIN TOOLS


Style: Meter


Power Source: Battery Powered


Color: Orange


Product Dimensions: 7.74"D x 2.16"W x 1.46"H


Item Weight: 5.1 Ounces


Alarm: Visual


Global Trade Identification Number: 55


Material: Blend


Number of Items: 1


Power Source: Battery Powered


Alarm: Visual


Product Style: Meter


Color: Orange


Item Dimensions D x W x H: 7.74"D x 2.16"W x 1.46"H


Item Weight: 5.1 Ounces


Enclosure Material: Blend


Brand: KLEIN TOOLS


Model Number: ET110


Global Trade Identification Number: 55


Manufacturer: Klein Tools


UPC: 092644690655


Item Length: 7.75 Inches


Item Width: 2.16 Inches


Item Type Name: Carbon Monoxide Meter


Built-In Media: Batteries, Pouch


Unit Count: 1.0 Count


Frequently asked questions

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Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

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View our full returns policy here.

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Top Amazon Reviews

    • Great Product
Great Product
Reviewed in the United States on March 14, 2026 by Metal Fab Guy
    • Works as is should! Must have if all appliances are gas.
I bought three ten year life span Kiddie CO detectors to replace our alarms and a few months later, one was continuously tripping. Ordered this CO meter to find the source and no leaks, just a bad CO alarm. I held this Klein meter in front of the furnace exhaust outside the house and it immediately set an alarm. Works great and peace of mind knowing your family is safe if a $30-$40 alarm is going off! ... show more
Reviewed in the United States on March 28, 2026 by jnormn
    • Appears to work as expected.
Appears to work as expected. Reports zero when in clear air. Reports over 300PPM when placed about 4ft from UTV exhaust (it's a 20 year old gas engine). The response time was 2-3 seconds 4ft from gas engine exhaust and readings zoomed over 300ppm and I moved away. Real world quick test appears to work. I tested our home air ducts in several places with this meter and all of them read 0. We wanted to put a number to CO ppm in addition to the smoke detectors with CO detection which always show OK without any numeric value. Having a good quality meter seems like a wise idea if you have natural gas or propane heating. I am happy with the unit after one use. Note: If you are a home owner and not likely to use the meter very often, consider removing the AAA batteries after each use so there is no chance of a battery leaking into the meter. ... show more
Reviewed in the United States on September 22, 2024 by Kelle_Jane
    • Appears to be Worth Buying
Was a little reluctant in buying this product because of some reviews in different sites, mixed reviews. I tried it about a foot away from the exhaust pipe of a vehicle and did get reading of 1 ppm and 5 ppm about three inches away which thought was way too low. I have a wall furnace so decided to put the sensor portion into the top vent with just the pilot light on. After about ten seconds got a consistent reading of 3 ppm, pulled it out and meter zeroed out. Tried it again and after a bit got a constant reading of 5 ppm so I felt the meter was functioning as it was meant to. Probably works better than other detectors under $100. ... show more
Reviewed in the United States on January 5, 2026 by JAMES PEDRAZA
    • Sensitive, easy to use, CO2 tester
I had several propane leaks in a new house that we moved into. I bought the gas sniffer from Klein which was great. At that point I wanted to make sure nothing else was wrong. So I bought this. To test it I tried it in another house that had a ventless propane fireplace. Once i turned the fireplace on it registered a slight increase in CO2, but well within an acceptable range. It brought peace of mind to my wife which makes it priceless! ... show more
Reviewed in the United States on May 11, 2025 by Marnie Gordon
    • Appears to Work
Bought it for peace of mind, to check bedroom wood stove and vent joints for carbon monoxide leaks. Have not found any CO with it, or with a different brand whole room CO detector.
Reviewed in the United States on March 5, 2026 by Mountain Man
    • Quality Meter
Professional quality meter. Very well built
Reviewed in the United States on March 31, 2026 by Amazon Customer
    • Happy with this.
I've got a few Klein tools like this. I'm using this to monitor my out building while running a Mr. Heater 75k - 125k propane heater. All is good. I tested this unit in my garage after running the car for 1 minute. It showed the accumulation of carbon monoxide (dangerous levels). The Mr. Heater runs soclean I wanted to see a reading greater than zero. LOL ... show more
Reviewed in the United States on February 4, 2026 by Jim

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