Sper Scientific736710 Sling Psychrometer,- 20 ~ 120 F

First of all I am a coatings inspector I use these almost every day at work. The one I got was Not accurate. the material used to keep the wet bulb wet does not sit tightly on the wet bulb so thier is a pocket of air between the material and the bulb. Did not give an accurate reading. Compaired to the Bacharach. If your like me and dont want the same Bacharach that everyone else has then do what I did and search for a vintage sling they are well made and cost around 25 bucks.

it's good.