Anytime I leave a liquid filled compass in a vehicle, it gets a bubble in it. Texas heat I assume. Is their a way to prevent this? Is it normal? or is there a better compass that won't get bubbles, without breaking the bank? I'll admit most of my compasses range in price from 1 to $15. The $1 compasses were never expected to last. But they surprisingly worked better than I thought they would. I don't plan to spend $100 for a compass. So any thoughts, suggestions, ideas, etc..? Thanks.