Can I use a Pyrex measuring cup as a double boiler?

Online Answer
My friend and fellow blogger, Cari Dunn of Everything Pretty, told me that she uses a canning ring to convert a glass Pyrex measuring cup into a double boiler in a pinch.
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Generations of bakers and cooks have relied on the Pyrex measuring cup. It's marked in red for at-a-glance precision, and the handle and spout are designed for controlled pouring. Durable Pyrex glass lets you melt butter, chocolate and more right in the cup, and is dishwasher safe for easy clean-up..
The brand has been a kitchenware staple for over a hundred years, with its glass cookware, measuring cups, and more that could withstand temperature changes. ... "Since Pyrex is no longer made of the same special thermal shock resistant glass, one should take extra care when using it. Do not place Pyrex on your stovetop.
Measuring rice correctly is the key to make delicious rice. For rice measurement, we use a traditional Japanese measure called go or rice cup. A level cup of this measuring cup is 1 rice cup. 1 rice cup equals approximately ¾ US cup or 180 ml..
Put rice in a sauce pot. Stick your middle finger into the rice and add water until it comes to right above the first indentation in your finger. Then cook it low and slow. That's it.
In addition to looking great, Pyrex measuring cups are microwave, freezer, (preheated) oven, and dishwasher safe, and since they're made of glass, they won't absorb any odors, flavors, or stains.