I am looking for a radon gas detctor module, will any of these work for that? Which one?

No. you need to look for specific devices here to detec that. Radon is an radioactive element not molecule.

Which of these sensors detect ammonia?

There is a mark under each sensor, you can distinguish according to the mark

What does the m135 air quality sensor detect? Specifically?

The MQ-135 Gas sensor can detect gases like Ammonia (NH3), sulfur (S), Benzene (C6H6), CO2, and other harmful gases and smoke. So basically it will give you values in ppm for these gases I mentioned. It is not very specific as you may see.

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9 in 1 MQ Sensor Modules Kit Project Super Starter Kits for Gas Detection

9 in 1 MQ Sensor Modules Kit Project Super Starter Kits for Gas Detection

Product ID: 84181400

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Details

Brand
BAITHNA
Power Source
Battery
Color
blue
Item Weight
3.21 Ounces
Alarm
Visual
Manufacturer
BONATECH

⚡DC 5V stable power

💡Signal output indicator light

⏱️Quick response & recovery

Description

🌬️ Breathe easy, detect smarter — your all-in-one gas guardian!

DUAL SIGNAL OUTPUT - Analog + TTL outputs for precise, real-time monitoring
VISUAL ALERT SYSTEM - Integrated indicator light keeps you instantly informed
PLUG PLAY MODULAR DESIGN - Easy mounting with plug-in probes for hassle-free setup
HIGH SENSITIVITY STABILITY - Reliable detection from 10 to 1000ppm with long service life
COMPREHENSIVE 9 IN 1 GAS DETECTION - Detects ammonia, smoke, CO, methane & more for total air safety

The 9 in 1 MQ Sensor Modules Kit by BAITHNA offers a professional-grade solution for detecting a wide range of harmful gases including smoke, carbon monoxide, methane, and more. Powered by a stable 5V DC source, it features dual analog and TTL outputs with a visual indicator light for instant alerts. Designed for quick response and long-term reliability, this kit is perfect for environmental monitoring and safety projects, delivering precise gas concentration readings from 10 to 1000ppm in a compact, easy-to-mount form factor.

Specifications

Brand	BAITHNA
Power Source	Battery Powered
Color	blue
Item Weight	3.21 Ounces
Alarm	Visual
Manufacturer	BONATECH
UPC	634759567974
Part Number	BONATECH-004
Item Weight	3.21 ounces
Product Dimensions	6.3 x 3.5 x 1.6 inches
Item model number	8541582913
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

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