General Tools TSP200RC Twirling Psychrometer Subcategory:MOISTURE-HUMIDITY They have a rugged design

They have a rugged design for better impact strength

Special Features:Removeable file (Replacement file Cat

1-piece construction

with chin strap

D248-8 8""Angled Head Diagonal-Cutters

General Tools TSP200RC Twirling Psychrometer Subcategory:MOISTURE-HUMIDITY They have a rugged designThe #TSP200RC Twirling Psychrometer can measure the dry bulb and wet bulb temperatures and derive the relative humidity from the difference between the two values. Red Spirit filled C readout Fast, accurate and easy to use Made of high impact plastic No assembly required Replacement thermometers (#RTSP) are available Additional Information ManufacturerGeneral Tools IncludesTwo thermometers (#RTSP) One wick 1 year limited warranty Dimensions8. 5 x 1.