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