Sensorcon Inspector II Portable CO Detector with Live PPM Display, INS2-CO-01

Your wall alarm tells you there's a problem. The Inspector II helps you find it. A live parts-per-million reading lets you walk from room to room, check the furnace closet, the water heater and the attached garage, and see exactly where the number climbs. It comes with a 2-year warranty.

Find the Source, Not Just the Beep

Most home CO alarms stay silent until levels have been high for a while, and many don't show a number at all. The Inspector II shows the actual CO level from 1 ppm up, so you can catch a slow leak early, confirm a repair actually worked, and check a rental or hotel room before you settle in.

When the Alarm Isn't There

In December 2021, seven members of one family were found dead in their home in Moorhead, Minnesota. Police later said a furnace was the source of the carbon monoxide. Investigators also found that the CO detector in the garage had been removed and replaced with a smoke-only detector. Working alarms on every level come first. A portable meter adds the exact number an alarm can't show, and it goes with you wherever you go.

What You Get

• Live ppm readout: See the CO level, up to 1,999 ppm.
• Alarms at 35 and 200 ppm: An 80-85 dB buzzer and flashing LED.
• MAX recall: See the highest level it recorded overnight or while you were out.
• Fast: Responds in under 20 seconds.
• Tough: IP67 waterproof and dustproof, shock-resistant case.
• 2+ year battery on one CR123A, and a 2-year warranty.

Want an alarm you can feel? See the Inspector II Industrial (INS2-CO-02). Shopping on a budget? The Inspector (INS-CO-01) has the same live readout with a 1-year warranty.

Who It's For

• Homeowners with a gas furnace, water heater, range or attached garage
• Renters and landlords checking a unit
• Anyone who wants to confirm a repair actually fixed a CO problem
• Travelers checking a rental or hotel room

What's in the Box

• Sensorcon Inspector II CO detector, INS2-CO-01
• Steel alligator clip with lanyard loop
• Instruction manual

Documents: Product brochure (PDF) | Instruction manual (PDF)

Service, Savings and Backup Units

• $49 calibration + new battery in 48 hours: Send it to our authorized Western/Central US service center for a certified-gas zero and span calibration, a new or spare battery, and a full alarm and function test. Free return shipping, and 24-hour service is available. Choose your authorized service center.
• $25 off a backup unit: Order a Western/Central US calibration and we'll email you a code for $25 off a new Sensorcon detector, so you're never without protection while yours is in for service. Only at COdetectors.com.
• Built to be rebuilt: When the sensor wears out, Sensorcon's $69 rebuild brings your Inspector back instead of sending it to a landfill.
• Volume pricing: Buy 5 or more Sensorcon detectors and your price per unit drops, with an even lower price at 10 or more. Mix any models. The discount applies automatically in your cart.

Frequently Asked Questions

How do I use it to find a CO source?

Turn it on outdoors in fresh air, then walk slowly through the house. Pause for 20 to 30 seconds near each fuel-burning appliance, including the furnace, water heater, range, fireplace and attached garage, and watch where the reading rises. If you see a sustained reading or the alarm sounds, get everyone outside and call your gas utility or 911.

Does this replace the CO alarms in my home?

No. The Inspector is a portable monitor. Keep a UL 2034 listed CO alarm on every level of your home and near sleeping areas, and use the Inspector to carry protection with you and to pinpoint where CO is coming from.

Is the Standard model a personal safety monitor?

Sensorcon does not classify the Standard model as a personal safety device. If your job requires a classified personal monitor, choose an Industrial or Industrial Pro model.

How do I keep it accurate?

Electrochemical sensors drift over time, so plan on regular calibration. Our $49 Western/Central US service includes certified-gas calibration and a new battery, back to you in 48 hours.

Compare the Inspector II Models

Same sensor and live readout in every model. Here is what changes as you move up.

	YOU'RE VIEWING StandardINS2-CO-01	IndustrialINS2-CO-02	Industrial ProINS2-CO-03
What It Does
Live CO reading in ppm	✓	✓	✓
Peak (MAX) reading recall	✓	✓	✓
Loud buzzer, 80–85 dB	✓	✓	✓
Flashing light alarm	✓	✓	✓
Vibrating alarm	—	✓	✓
Adjustable alarm levels, 5–500 ppm	—	—	✓
24-hour exposure average (TWA)	—	—	✓
Built to Last
Certified intrinsically safe	—	✓	✓
Water, dust and shock resistant	✓	✓	✓
Operating temperature	-4 to 122°F	-4 to 122°F	-4 to 122°F
Battery life	2+ years	2+ years	2+ years
Warranty	2 years	2 years	2 years
Assembled in the USA	✓	✓	✓
Service at COdetectors.com
$49 calibration + new battery, 48 hours	✓	✓	✓
$69 Sensorcon rebuild	✓	✓	✓
Best for	Home, RV, travel and everyday carry	Garages, workshops and loud places	Custom alarm levels and all-day exposure tracking

See calibration and rebuild details.