The most accurate and well-marked heatproof plastic and glass measuring cups I have found are made by POURfect and Anchor Hocking. A cup of water, read below the bottom of the meniscus (the curved upper surface), should weigh close to 8.4 ounces/237 grams. If using a metric cup, this is equal to 237 milliliters (as milliliters are based on the weight of water). The standard metric cup is 250 milliliters, about 1 tablespoon more than the standard U.S. cup.
The plastic POURfect beakers are designed to pour without dripping and are heat resistant. The glass cups by Anchor Hocking are ideal for pouring hot sugar syrups and caramel. I use my 1 cup measures the most, but 2 cup and 4 cup measures are also useful, especially for reducing liquids, which bubble up. When measuring sticky substances such as syrups and molasses, spray the cup (or measuring spoon, for smaller amounts) with nonstick cooking spray before using. This will help prevent the syrup from bubbling up and will make it easier to remove. A mini measure is accurate for measuring small amounts of liquid. It measures from 1 teaspoon/5 ml up to 6 teaspoons (2 tablespoons/30 ml).