Just to compare them and not to weigh them, then you could use a seesaw.
balance
A student could use a digital scale or a balance to compare the masses of two small rocks. Simply place one rock on the scale, record the mass, then repeat with the other rock to make the comparison.
A balance scale can be used to compare the mass of a large rock to the mass of two wooden blocks. Place the rock on one side of the scale and the two blocks on the other side. By observing which side tips down, you can determine which has more mass.
A balance scale can be used to compare the mass of a large rock to the mass of two wooden blocks. Place the large rock on one side of the scale and the two wooden blocks on the other side. The side that tilts down lower will indicate which set of objects has a greater mass.
magnifying glass, loupe or a microscope.
dooplicator
Just right click the top of a block. If you mean how do you stack them in your inventory, it should be automatic. Unless its a door, a tool, ETC
To determine if your SD card is faulty due to bad blocks, you can use a disk checking tool to scan for errors. If the tool detects bad blocks on the SD card, it is likely that the card is faulty and may need to be replaced.
Windows Firewall
write"/more" in comands
D2 tool steel is a steel, tool steel. For cold rolled steel, D2.
I think no because the blocks would be too heavy to weigh.