Mastercool 52230 Pen Type Hygrometer August 22, 2012 by admein Order Code : MS30 Features : Rotating cap to protect sensor. Data hold to capture readings. LCD Digital display. Max/ Min record function. A Quality product from Mastercool, USA. Technical Specifications : Temp. Range : -4 to 140 F ( -20 to 60 C ). RH % range : 0 to 100 % RH. Size : 6.8″ X 1.6″ X 0.6″. pdf-Mastercool52230PenTypeThermo-Hygrometer