Design, construction, and testing of an accurate low-cost humidistat for laboratory-scale applications Lars B. Veldscholte, Rens J. Horst and Sissi de Beer Eur. Phys. J. E, 44 4 (2021) 48 Published online: 05 April 2021 DOI: 10.1140/epje/s10189-021-00062-5