Excellent quality, works perfectly and is easy to use. Instructions are not required. I've been using it in my garden for 5 months now and haven't had any problems. I enrich my garden with CO2 from the normal 350ppm to around 1200ppm. Sometimes I treat pests with CO2 and this unit has an alarm that can be set from 0 to 9999ppm. I open the carbon dioxide bottle and walk out the door. I only come back after the alarm goes off (I set the alarm to 5000ppm and the alarm goes off when it goes below 2000ppm).
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