How to measure Voltage & Current with a single multimeter, Simultaneously?
Q1. They do exist, but they are (much) more expensive. In most cases you can measure a fixed battery voltage and continue to assume that voltage while measuring current. Or, you can buy a meter with a dual display, but those typically aren't cheap. Most dual display meters though can't do everything you need - for example, they can only measure voltage and frequency at the same time. I'd suggest what you do instead is keep the nice meter for accurately measuring most things but buy one of the cheapie Mastech £3 meters to measure the second quantity. They actually do pretty well, most within 0.5% accuracy. And it's no big deal if you damage one.

Q2. I've heard good reviews from this one, designed for model aircraft.