Answer:
You can use a refractometer but it's a bit spendy ranging in price from $100 - $500. Or an inexpensive solution is using Benedict's reagent solution. You put 1ml of Benedict's into 5 -7 drops of liquid that your testing and heat it over a flame in a testtube. The higher the sugar content, the sugar content turns an orange-red and the lesser amount of sugar the solution will turn yellow-green.