Torque wrenches are not always the best answer. A burr or deposits on the threads could cause the torque to vary from plug to plug. The important thing is that you get the proper gasket compression.
If the spark plugs have a crush washer on them, they typically should be turned 3/4 to 7/8 turn after contact. Generally you can consider contact when the plug is in finger tight. The box the plug came in usually gives the spec for after contact.
Plugs that have a tapered seat and no crush washer, are usually tightened to 1/16 to 1/8 turn after contact.
Although I have several torque wrenches, I no longer use them on spark plugs.
Edit: If you remove a spark plug with the crush washer and reinstall it, treat it like a tapered seat. Once the washer has been crushed, you can’t crush it much more, so about 1/8 to 1/16 turn is enough on the second time around.