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I find the metal indicator is more durable and that it fits more comfortable in my hand because it's thinner. But its plastic wheels will still wear and are susceptible to things that may eat plasitc (like mosquito repellent. Also, the metal surface is reflective, so be aware of the angle to the sun when you glance at it, or you may get blinded for a bit. Come to think of it, that reflectivity may be a good thing because it will help train officials to only glance briefly when they do glance at all.
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