Comparison page

MH-Z19B vs MQ-135

Side-by-side selection notes for specs, ecosystem readiness, known issues, and data confidence. This page is generated from structured component fields instead of a hand-written article.

MH-Z19B

Projects needing CO2 and NDIR with a commonly available sensors part.

MQ-135

Projects needing Air quality and Gas with a commonly available sensors part.

Specification Matrix

DimensionMH-Z19B MQ-135

CategorySensorsSensors

MakerWinsenWinsen

CoreNot specifiedNot specified

ClockNot specifiedNot specified

WirelessNot specifiedNot specified

Voltage3.3V3.3V

LibrariesArduinoArduino

Price$15.00 - $30.00$0.80 - $2.50

Known Tradeoffs

MH-Z19B

Breakout boards may use different pin labels or regulator choices
Clone modules can differ from the original datasheet part

MQ-135

Breakout boards may use different pin labels or regulator choices
Clone modules can differ from the original datasheet part

Open Individual Model Pages

MH-Z19B

Winsen

NDIR CO2 sensor module commonly used in indoor air quality projects.

China-madeSensors80% confidence

MQ-135

Winsen

Low-cost gas sensor module often marketed for air quality experiments.

China-madeSensors66% confidence