It's about as heavy as a Light Bulb.
It's about three-fourths as heavy as a Golf Ball.
In other words, 1.20 ounces is 0.74070 times the weight of a Golf Ball, and the weight of a Golf Ball is 1.350 times that amount.(per R&A USGA Rules of Golf; maximum rule weight)
According to the Rules of Golf (as approved by the United States Golf Association and the Rules Committee of the Royal and Ancient Golf Club of Saint Andrews), golf balls must weigh no more than 1.620 ounces. Golf balls are not required to have the familiar dimpled pattern, but the design has been popular since its invention in 1905 because it reduces drag while increasing lift.
It's about one-and-two-fifths times as heavy as a Battery (AA).
In other words, the weight of a Battery (AA) is 0.710 times 1.20 ounces.(Alkaline)
An "AA" size battery weighs 0.850 ounces. AA batteries came into common use during World War II and were given their name by the American National Standards Institute (ANSI) Committee C18 because they were smaller than the "A" size batteries which were invented first.
It's about one-and-three-fifths times as heavy as a Mouse.
In other words, the weight of a Mouse is 0.630 times 1.20 ounces.(a.k.a. "House mouse", Mus musculus) (adult)
The weight of a mouse is typically an average of 0.740 ounces. While most mice typically live two to three years, the Methuselah Mouse Prize — an award administered by a non-profit organization which advances aging-related research — was once awarded to a team of scientists whose research resulted in a mouse living just under five years.
It's about three-fifths as heavy as a Tennis Ball.
In other words, 1.20 ounces is 0.590 times the weight of a Tennis Ball, and the weight of a Tennis Ball is 1.690 times that amount.(ITF Standard; for Type 2 ball)
Per International Tennis Federation standard, regulation tennis balls must weigh about 2.04 ounces. Competition balls are also tested for bounce height, with the standards requiring that a ball dropped from 254 cm must bounce back to a height of 135 cm to 147 cm.
It's about half as heavy as a Battery (C).
In other words, 1.20 ounces is 0.520 times the weight of a Battery (C), and the weight of a Battery (C) is 1.90 times that amount.(Alkaline)
A "C" size battery weighs 2.30 ounces. C batteries are typically used in medium-drain devices such as musical instruments.
It's about two-and-a-half times as heavy as a Compact disc.