These differ in a couple ways. First, some require external compressed air, while others have an internal pump. Also, models are either analog or digital, and are available with or without the SX-100 desoldering iron. The models are as follows: 8007-0502 = ST 65, analog, uses external compressed air, includes SX-100 iron • 8007-0503 = ST 65,analog, uses external compressed air, power station only • 8007-0506 = ST 75, analog, contains internal pump, includes SX-100 iron • 8007-0507 =ST 75, analog, contains internal pump, power station only • 8007-0508 = ST 115, digital,contains internal pump, includes SX-100 iron • 8007-0509 =ST 115, digital,contains internal pump, power station only
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Answered by Anonymous