When you catch one end of a spring balance in one hand and
pull the other end to show a reading of 10 kg, the force applied by your hand that is
pulling at the end is 10*9.8 = 98N.
The hand with which you
hold the spring balance also needs to apply to a force though it may not be equal to 98
N, but slightly less due to the weight of your hand itself and and the weight of the
spring balance.
If there was no force applied by your other
hand you could lift the spring balance by applying a force equal to just the product of
mass of the spring balance and the acceleration due to gravity. Also, the reading shown
on the spring balance would be 0 kg instead of 10 kg.
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