analytical balance
Used especially in the laboratory for taking very precise weight measurements.
leveling screw 
Screw for adjusting the level of the balance’s base.
pan 
Flat rigid support on which the specimen is placed.
door access 
Sliding doors that provide easy access to the inside of the glass case.
glass case 
Glass box that protects the pan from air currents and dust that might cause a false reading of the weight.