<span class="link_user">@Zizidoem</span>, do you mean the small white box? If yes then that is the spiderfarmer 5 in 1 sensor. It measures humidity,light, temp, co2 and vpd.
<span class="link_user">@IberianRacoon</span>, white widow grows like crazy. A bit sensitive to overfeeding, as it was the first one to show burnt tips. But the growth is monstrous.
