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INKBIRDPLUS Ndir Air Quality Monitor Indoor, CO2 Monitor in Home, Room | Battery Powered 3 in 1 Air Quality Detector for CO2 & Temperature & Humidity for Room, Office, RV, Grow Tent (PTH-9C)
Compact CO2 monitor with an NDIR sensor, a backlit LCD that also shows temperature and humidity, and a buzzer alarm with user-set thresholds. It reads 400–5000 ppm, a narrower range than the 0–9999 ppm models, and recharges over USB, with a hanging hole for wall mounting. Low-priced next to most NDIR units listed, it suits budget buyers who only need basic CO2 readings in a van or grow tent.
- Max. CO2 detection
- 5,000 ppm
- Min. CO2 detection
- 400 ppm
- Brand
- INKBIRDPLUS
Specifications
These details are subject to change and may not be current. Please check Amazon or manufacturer web site to confirm before purchase; see our About page for more information.
- Manufacturer page
- Link
- Popular brand
- No
Detection capabilities
- Gases detected
- CO2
- Max. CO2 detection
- 5,000 ppm
- Min. CO2 detection
- 400 ppm
- Temperature & humidity readout
- Yes
Alarms
- Alarm types
- Sound (buzzer)
Physical Attributes
- Display type
- Backlit LCD
Warranty & Certification
- Warranty
- 1 Year
Features
Details from the INKBIRDPLUS Amazon listing:
- 【PREMIUM DETECTOR】This ndir CO2 Air Quality Monitor Indoor can accurately detect the current CO2 concentration, temperature, and humidity in the air. It can help you understand indoor air quality at a glance
- 【CO2 CONCENTRATION STAGE & SOUND】 This ndir Air Quality Monitor is designed with 3 stages of CO2 concentration—normal stage (400-700 ppm), warning stage (700-1500 ppm), and dangerous stage (1500-5000 ppm). It will alarm you when the detected CO2 concentration is beyond the safe value you customized
- 【CONVENIENT CALIBRATION】To ensure the accuracy of measurement, battery powered Air Quality Monitor supports the calibration function. Press three buttons at the same time in an open environment and let it stand for 200 seconds to calibrate this Air Quality Detector easily. This CO2 detector uses the NDIR CO2 sensor
- 【USB RECHARGING】The indoor Air Quality Monitor, supporting a long time of continuous use (input: 5V-1A), before it adopts a large and distinct LED screen for ease for temperature or data viewing. display based on your need
- 【WIDE APPLICATION】 A hanging hole is designed on the back of this portable indoor CO2 detector so that you can hang it up to the wall for easy viewing. The ndir CO2 Air Quality Monitor for grow tents is ideal for use in grow room, offices, kitchens, schools, kitchens, schools cellars, and cars
Similar products from other brands
Chosen for their similar specs and price:
 This productINKBIRDPLUS Ndir Air Quality Monitor Indoor, CO2 Monitor in Home, Room | Battery Powered 3 in 1 Air Quality Detector for CO2 & Temperature & Humidity for Room, Office, RV, Grow Tent (PTH-9C) |
 Temtop C1+ |
 Inkbird INK-CO2W |
 ATuMan CF1 |
|
|---|---|---|---|---|
| Price | $42.99 | $42.99 | $55.99 | $59.99 |
| Model | – | C1+ | INK-CO2W | CF1 |
| Popular brand | No | No | No | No |
| Gases detected | CO2 | CO2 | CO2 | CO2 |
| Max. CO2 detection ppm | 5,000 | 5,000 | 5,000 | 5,000 |
| Min. CO2 detection ppm | 400 | 400 | 400 | 400 |
| Accuracy | – | ±(40ppm +5%) (400-2500ppm) | – | – |
| Resolution ppm | – | 1 | – | – |
| Temperature & humidity readout | Yes | Yes | Yes | Yes |
| Sensor type | – | – | – | NDIR |
| Calibration method | – | Manual fresh-air calibration (about 400 ppm, 200-second countdown) | Manual calibration in open area (press three buttons together) | – |
| Data logging | – | Yes | Yes | – |
| Adjustable alarm levels | – | – | Yes | – |
| Alarm types | Sound (buzzer) | Buzzer (optional) and color-coded CO2 indicator | On-screen alert and app notification | – |
| Weight lbs | – | 0.24 | – | 0.46 |
| Weight kg | – | 0.11 | – | 0.21 |
| Length in. | – | 3.50 | – | 1.20 |
| Length mm | – | 89 | – | 30 |
| Width in. | – | 2.70 | – | 3.50 |
| Width mm | – | 69 | – | 89 |
| Depth/Height in. | – | 0.70 | – | 3.50 |
| Depth/Height mm | – | 18 | – | 89 |
| Display type | Backlit LCD | 3.3-inch segment-code LCD | Color screen | 3.0-inch LED display |
| DC input voltage | – | 5V | – | – |
| Charging port | – | – | – | USB-C |
| Battery capacity mAh | – | 800 | – | 2,200 |
| Battery chemistry | – | Lithium | – | – |
| Operating temp min ℉ | – | 14 | – | – |
| Operating temp max ℉ | – | 140 | – | – |
| Operating temp min ℃ | – | -10 | – | – |
| Operating temp max ℃ | – | 60 | – | – |
| Warranty | 1 Year | 1 Year | 1 Year | – |
Data sources
Data for this product compiled from this source:
Prices from Amazon as of . Product prices and availability are accurate as of the date and time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of the product. As an Amazon Associate I earn from qualifying purchases.
Specifications last updated Oct 29, 2026.