A superbly accurate motorized psychrometer.
Powitz
Robert W
RW
Balsamo
James J
JJ
D001331:Automation; D011211:Electric Power Supplies; D004784:Environmental Monitoring / Q000295:instrumentation*; D004867:Equipment Design; D006813:Humidity; D015203:Reproducibility of Results; D013696:Temperature; D013821:Thermometers / Q000592:standards