Pakistan customs

So im buying a monitor while in the UK, “ASUS ROG Swift PG27AQWP-W” to be exact, its a refurbished model from ebay, and im gonna be coming to pakistan for a month in December and want to bring the monitor with me and then take it back, what im wondering is will i have to pay customs fees or whatever at the karachi airport or at the UK airport when going back? Im probably going to travel with its original box and put it in luggage or i can try to put it in my checked luggage bag and would that change anything about the fees if they are applicable?