(2011? Yancheng) Xiao Ming used a pallet balance to measure the mass of an iron block. The scale of the scale used is as shown in the figure. The mass of the smallest weight is related to the maximum

(2011? Yancheng) Xiao Ming used a pallet balance to measure the mass of an iron block. The scale of the scale used is as shown in the figure. The mass of the smallest weight is related to the maximum scale value of the scale.

Before using a balance to measure the mass of an object, place the balance on a horizontal table, move the cursor to the zero mark on the left end of the ruler, and adjust the balance nut to balance the balance;

Place the iron block on the left plate and the weight on the right plate. If the pointer moves to the left, it means the iron block on the left is heavier. The mass of the iron block is greater than the mass of the weight. Add a 5g weight. If the pointer moves to the right, it means the weight on the right. If it is heavy, you should take out a 5g weight and move the weight (moving the weight is equivalent to adding a smaller weight to the right plate) until the balance is balanced.

So the answer is: 0 (or "zero"); greater than; use tweezers to take out the 5g weight and put it back into the weight box, and then move the weight.