Klein Tools ET110 CO Meter
- 0 to 1000 ppm CO measurement
- 35 ppm low and 200 ppm high alarms
- STEL alarm for short-term exposure
- Audible and visual alerts
- Auto-off after 20 minutes
- 4 AAA batteries and pouch included
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A handheld CO meter that reads concentration and temperature with low, high and exposure alarms for HVAC work. It is a portable tester, not a wall-mounted home alarm.
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ASIN: B071GGL75NModel: ET110Category: Carbon Monoxide Detectors
Overview
An electrochemical style CO sensor in a handheld body reads carbon monoxide levels in ppm, shown on a backlit display with temperature. Low, high and short-term exposure alarms sound and flash when readings climb.
Portable CO readings with exposure alarms suit technicians checking appliances and flues. It runs on AAA cells with an auto-off to save power. Calibration and sensor life details are absent.
Who it's for
Technicians and inspectors who measure CO at furnaces, water heaters and vents suit the meter. Households needing continuous monitoring should buy a fixed alarm.
Pros and cons
- Reads exact ppm levels
- Two alarm thresholds plus STEL
- Backlit display with temperature
- Batteries and pouch included
- Sensor life not listed
- Warranty details point to the vendor
Performance notes
Readings depend on the sensor sampling air at the meter, so holding it near the source gives the clearest number. Alarms fire at set thresholds and on accumulated exposure. Auto-off saves batteries but can shut down during long idle checks.
Specifications
| Brand | Klein Tools |
|---|---|
| Model | ET110 |
| Dimensions & fit | |
| Item weight | 5.1 ounces |
| Power & efficiency | |
| Power Source | 4 AAA batteries (included) |
| Construction & materials | |
| Color | Orange |
| Included components | |
| Included components | Meter, carrying pouch, 4 AAA batteries |
| Other details | |
| Sensor Type | CO, 0 to 1000 ppm |
| Alarm | 35 ppm low, 200 ppm high, STEL; audible and visual |
| Display | Backlit, CO and temperature (F/C) |
| Auto off | After 20 minutes of inactivity |
Frequently asked questions
How big is the Klein Tools ET110?
It measures 7.74 x 2.16 x 1.46 inches and weighs 5.1 ounces.
Is the Klein CO meter a home CO alarm?
No. It is a portable meter for measuring CO levels, with alarms at 35 ppm and 200 ppm.
Are batteries included?
Yes. It includes 4 AAA batteries and a carrying pouch.
Does it shut off by itself?
Yes. It powers off after 20 minutes of inactivity.