External sensor for a Sempre (Lidl) digital weather station (Sparkhill B11)

I’ve been given 2 old Sempre digital weather stations (from Lidl I think, or Aldi). I only have one external sensor and it’s not working. So ideally I’d love to have 2 sensors. Code no. GT-WT-02. A power supply would be great too. I’d happily accept a complete system if that was useful to you. I can arrange to collect.