The difference between them is the Pure Sine Wave inverter produces a better and cleaner current. They are also considerably more expensive. You might find it practical to get a small Pure Sine Wave inverter for any special need you may have, and also a larger Modified Sine Wave inverter for the rest of your applications.
Elm Trees can live over 100 years in their natural environment.
How to Identify an Elm. Elm trees are a relatively common tree and easy to identify, once you know what to look for: Elms have oval-shaped leaves with a saw-toothed edge that alternates in two rows pointing away from the shoot. One side of the leaf joins the stalk higher than the other.