... LED digital tube display, visible distance is 10~50meters 2. Temperature humidity calibration function. Products IntroductionHE2XXA Series large screen Thermo-Hygrometer ... simple performance, firm structure, high accuracy.n Adopt LED digital tube display, clear and bright, visible distance is 10~ ... , supermarket, warehousing, hospital, and indoor environment etc. LED Thermo-hygrometer (large display)