Silaria
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CPE will use a similar measuring tool or they can use U-shaped PVC wickets. Each U is set to the max dog height for a jump height (4, 8, 12, 16, & 20). If the wicket touches the table the dog is standing on, they try the next smaller one. If that doesn't touch the table, they know the dog is between the max for for jump height X and jump height Y so therefore jumps height Y.

