Calibratable humidity and temperature sensor for duct mounting HYGRASGARD®KFTF - 20 - Modbus - T3 (± 1.8%), with Modbus connection, in an impact-resistant plastic housing with quick-release screws, optionally with/without display, with plastic sinter filter (replaceable), with mounting flange, for precise measurement of relative humidity (0…100% r.h.) and temperature (–35...+80 °C) and for determining various characteristic parameters of humidity measurement technology. The international system of units SI (default) can be switched to Imperial (via Modbus). For the wModbus device version, W-Modbus (Wireless) replaces the RTU cable; the connection to the building management system is made wirelessly via a W-Modbus gateway.