How can I tell what mm size and I need for my pole 4 watch
How can I tell what watch band mm I need to get for my Apple 4 ?
Apple Watch Series 4, watchOS 5
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The entry for the Apple Watch in the Apple Watch app on your paired iPhone should list the size.
More effort... On the Watch, Settings > General > About > Model, then look up the model code:
MacTracker lists the following models:
A1977 (40mm GPS) A1978 (44mm GPS) A1975, A2007 (40mm GPS + Cellular) A1976, A2008 (44mm GPS + Cellular)