The translucent tank is a new design that Consumer Reports just tested. It allows you to see the propane that's still in there. And if you have trouble seeing the liquid, you can highlight the back of the tank to more clearly see it. But those tanks can be pricey. One costs $90, and Consumer Reports found that it didn't fit in some grills.
Another solution is getting a grill with a propane gauge. But if your grill didn't come with a gauge, you can get an aftermarket one that tells you when it's time to refill.
Another solution is to keep a second tank on hand. Always keep it filled. When the other tank runs out, just switch them and you're ready to go.
If you're looking for a new grill that comes with a propane gauge, Consumer Reports recommends the Weber Genesis E330. It's pricey, at $800. But it performed well in Consumer Reports' low- and high-temperature tests, and its coated cast-iron grates are perfect for grilling. Or you can look online for one of those aftermarket gauges. Expect to pay between $13 and $30.