Testo, 0636 2135, Thin Humidity Probe for Material Moisture Equilibrium MeasurementThin humidity probe with built-in electronics, incl. 4 attachable Teflon protection caps for material moisture equilibrium measurementIncludesThin humidity probe (∅ 4 mm) with PTFE protective cap and adhesive modelling clay (4 items), including fixed cable.Materials which take in and retain or release water are described as hygroscopic materials. Hygroscopic materials always try to form a moisture equilibrium with the surrounding air. This principle is used to measure the moisture in material by measuring moisture equilibrium. Ideally, moisture equilibrium is measured in a bore hole in the material. To keep the bore hole as small as possible, a thin .16 in. humidity probe is used. It should be protected from dirt by a Teflon cap during measurement. The bore hole is then simply sealed using sealing clay. Based on the moisture equilibrium measured, testo 635 automatically shows material moisture in % in the display. Material moisture calculation is available for the following materials: Concrete High-insulation bricks Solid bricks Hard wood Soft wood Gas concrete Particle board Calcium sulphate floating screed Cement floating screed Lime sand brick Materials are easy to select from the menu. Using the "Material" user profile, the material can be accessed directly at the touch at a button. Additional material characteristics can be stored in testo 635-2 using ComSoft.FeaturesMeasurement of the material moisture via the equilibrium moisture contentSlim design (∅ 4 mm) with remote electronics - ideal for tight measuring points.