What can be determined about your technique if you get poor precision from the same instrument that your lab partner uses with excellent precision?

If you are getting poor precision from the same lab instrument your partner is getting excellent precision, that is saying your technique is either wrong, or miscalculated

“other instruments such as gravimeters and magnetometers are also used in the search for petroleum. extracting crude oil normally starts with drilling wells into an underground reservoir. when an oil well has been tapped, a geologist (known on the rig as the "mudlogger") will note its presence. “ this is what i found on google i hope it

You would need to take a picture so i can see