Just an FYI, we are more than happy with the chambers that you have provided us. They are far and above any other chamber that we have purchased or used in the past! Going forward, we will only be considering Darwin stability chambers!! The way they achieve, control and maintain there respective operating parameters is very impressive and nothing has compared to their operation that we have found!! They are more efficient and cost less to operate compared to the other “standard” type of stability chambers available of there. So in other words, great job on a superior product as we look forward to continued business with you. - Mar 27, 2018