It takes 40 litres of maple sap to produce 1 litre of maple syrup.
To adjust your thermometer
Put your thermometer in boiling water and see what your thermometer reads ex.
101 Celsius.
To produce maple syrup:
You need to bring the sap 4o Celsius above boiling water ex in this case 101
+ 4 = 105 Celsius.
To obtain other products
Maple butter :Add 11.5 Celsius above the water
Maple toffee: add 15 Celsius
Hard sugar: 18 Celcius
Granulated sugar : add 25 Celsius