"Hygrophil" electronic wet and dry bulb hygrometer type 4451A no.61896
"Hygrophil" electronic wet and dry bulb hygrometer type 4451A no.61896 scaled 32 to 194 degree fahrenheit in three ranges, with wet and dry bulb thermocouple probe unit, all in leather case, made by Ultrakust; (two corners of thermometer unit chipped)
