Product review (2 stars): All you get is a CO2 meter and the price is a joke
Every family alreay has a temporature/humidity meter, costing $10. So this product only gives you a CO2 function, but even this function overlaps with Smoke/Carbon-Minoxide detector. Therefore the CO2 meter has minimal add-on usage. The price [...] is a joke. [...] price may attract a hobby scientist like me to buy.