I agree with Killer. I have done a bunch of test runs for Subbing and if you nuke a clean sample for about 8 seconds it seems to stay at about 97.3 to 97.8 for several hours. Just make sure your test is within 2 hours or so and you should be fine.
Allee Elm. Ulmus parvifolia. Ulmaceae. No Image Available: Height 30'-40' Spread 35'-45' Deciduous. The Allee Elm is a large deciduous tree that grows in most soils. Leaves turn a golden color in fall with distinctive peeling bark. Drought tolerant.
1 Look for areas likely to contain thriving elm trees.  Elms adapt to a variety of climates and planting situations, including poor or mildly salty soil, extreme cold, atmospheric pollution, and drought. However, they prefer areas that are in full sun to part shade with well-drained, but moist, soil.