Based on this product's specifications, here are some alternatives and similar models
Indoor electronic hygrometer TFA 30.5038 — square display, battery-powered AA, 94×94×37 mm
Summary description:
TFA 30.5038 is an indoor electronic hygrometer with a square display and battery power. It measures relative humidity for home or office use and runs on a single 1.5 V AA battery. The compact housing measures 94 × 94 × 37 mm, providing a portable, wall- or tabletop-capable humidity monitor suitable for monitoring climate in living rooms, bedrooms, and workspaces.