can i set the temperature to negative 5 degree celsius

In the context of the freezers from Williams Crystal that you referenced, such as the LC1TCB and LC2TCB models, these units are designed to maintain temperatures between -18°C and -22°C. Unfortunately, they do not allow for settings above -18°C, which means you would not be able to set the temperature to -5°C. If you're looking for any specific application that requires a temperature of -5°C, it may be worth considering other types of refrigeration equipment, such as commercial refrigerators or display fridges that operate within that temperature range. Should you need further assistance or want to explore more options tailored for your needs, feel free to let me know!