Compact Psychrometer - The Compact Whirling Hygrometer instrument incorporates a ‘slide rule’ type calculator to determine the % RH. The body of the instrument slides away into the handle providing complete protection when not in use. Fitted with environmentally friendly LO-toxTM filled glass tubes. Product Specifications Temperature Range: -5 to +50°C Humidity Range: -5 to +50°C Divisions: 0.5 Accuracy: +/-1°C CE: N/A ROHS/WEEE: N/A Casing Material: ABS Product Weight: Packaged - 90g / Unpackaged - 73g Product Dimensions : Packaged - 41 x 213 x 19.5mm / Unpackaged (closed) - 36 x 210 x 16mm Display Box Weight: 17g Display Box Dimensions: 41 x 213 x 19.5mm