This is a four-pack of the 250 mL sample bottles that are included with the Carbon Dioxide Gas (CO2) and the Oxygen Gas (O2) Sensors.
https://www.pasco.com/products/replacement-parts/se-6938#specs-panel
This is a four-pack of the 250 mL sample bottles that are included with the Carbon Dioxide Gas (CO2) and the Oxygen Gas (O2) Sensors.
https://www.pasco.com/products/replacement-parts/se-6938#specs-panel