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1. For same model
It only depends on manufacturer's production process, and enough material content.
2. From product appearance
Qualified product looks like attractive and durable, eg. Panel shape should be regular, surface should be marked clearly, the paint surface should be smooth, no scallops, salient point, lack of material, etc.
3. The core component of magnetic chuck - coil.
High quality, plenty of aluminum wire can make sure the enough magnetic force and durability of crane electromagnet; High quality aluminum wire protective coating material can reduce the failure rate.
4. Production Process.
Panel/base plate need to be waterproof insulation treatment, which can reduce the failure rate.
5. Appliance Components
Qualified appliance components can ensure the stability of the magnetic chuck.