The Klein Tools ET110 Carbon Monoxide Detector measures CO concentration from 0 to 1000 ppm with dual exposure limit alarms at 35 ppm (low) and 200 ppm (high) on a backlit LCD display. Temperature readings in both Fahrenheit and Celsius are shown simultaneously. Audible and visual alerts notify users of dangerous CO levels, and auto power-off after 20 minutes conserves battery life. Designed for HVAC professionals, electricians, and safety inspectors. Includes carrying pouch and 4 AAA batteries. Backed by a 1-year limited warranty.
What are the two CO alarm thresholds on the ET110?
Low alarm triggers at 35 ppm — matching the OSHA 8-hour TWA permissible exposure limit. High alarm triggers at 200 ppm, consistent with ceiling concentrations requiring immediate action. Both deliver simultaneous audible and visual (LED) alerts.
How does the ET110 CO detector differ from combustible gas detectors like the ET120?
The ET110 uses an electrochemical sensor specific to carbon monoxide. It will not respond to methane, propane, or refrigerant leaks. For combustible gases, use the ET120 or ET190; for refrigerants, use the ET160.
What is the detection range of the ET110?
0 to 1,000 ppm CO. Below 35 ppm no alarm sounds. At or above 200 ppm the high alarm activates, indicating concentrations that require evacuation and ventilation.
Where should the ET110 be held when sampling for CO?
At breathing-zone height (4–5 feet) for personal exposure assessment, or near appliance combustion zones and exhaust outlets when diagnosing an appliance. CO disperses relatively uniformly, so exact probe position is less critical than with heavier-than-air combustible gases.
Is the ET110 suitable for confined space CO monitoring?
The ET110 is a spot-check survey tool, not a continuous confined space monitor. For confined space entry requiring continuous atmosphere monitoring with data logging and alarming, a dedicated CGI or 4-gas instrument is required per OSHA regulations.
# Klein Tools® ET110 Carbon Monoxide Detector with Carry Pouch and Batteries **Model:** `ET110` **Brand:** Klein Tools **Category:** Gas Detector > The Klein Tools ET110 Carbon Monoxide Detector measures CO concentration from 0 to 1000 ppm with dual exposure limit alarms at 35 ppm (low) and 200 ppm (high) on a backlit LCD display. Temperature readings in both Fahrenheit and Celsius are shown simultaneously. Audible and visual alerts notify users of dangerous CO levels, and auto power-off after 20 minutes conserves battery life. Designed for HVAC professionals, electricians, and safety inspectors. Includes carrying pouch and 4 AAA batteries. Backed by a 1-year limited warranty. ## Specifications | Attribute | Value | |---|---| | Product Type | Carbon Monoxide Detector | | Gas Type | carbon monoxide | | Detection Range | 0–1000 ppm CO | | Detection Sensitivity | Low alarm: 35 ppm; High alarm: 200 ppm | | Alarm Type | Audible and visual (LED) | | Battery Type | 4 x AAA | | Overall Length In | 7.75 | | Assembled Weight Oz | 5.1 | | Barcode (UPC) | 092644690655 | | Warranty | 1-year limited | ## What's Included - CO Detector - 4 x AAA Batteries - Carrying Pouch Source: https://www.jaspecs.com/klein-tools/gas-detector/et110-klein-tools-carbon-monoxide-detector-carry-pouch-and-batteries/