Choosing one type of moisture meter above the other should depend on the type of work you need for and the price and technological differences between the two moisture meters. The major drawback of a pin meter is that it damages the surface while taking a reading and it can be hard to drive the pin into the surface. On the contrary, pinless moisture meters only scan the surface without it and take practically no force at all to operate. Both moisture meters are prone to inaccuracies as the reading can be skewed due to factors like temperature for pin meters and irregular surfaces for pinless meters. If you are measuring the moisture content of your firewood, a pin meter is recommended because a small hole in the wood is not a problem for something that will eventually burn. Also, a piece of firewood will have irregular surfaces and pinless meters will provide an inaccurate reading if not measured correctly. A moisture meter having both pin and pinless features will be an ideal suit if you are still confused about which one is the best for you.