Determining whether your toy crane machine's claw strength is correctly calibrated requires both observation and testing. First, understand that most commercial crane machines are programmed with specific strength settings - typically a weaker grip during movement and a stronger one when lifting. To evaluate your machine, start by observing the claw's behavior during multiple plays. A properly set claw should consistently reach the prize, attempt to close firmly, and occasionally successfully lift items.

Conduct the classic "drop test" by watching how prizes fall from the claw. If they consistently drop immediately without any lift, the strength might be set too low. Conversely, if the claw grips too firmly and rarely releases prizes, the setting might be too high. Check for consistency across different play sessions - random strength variations might indicate mechanical issues rather than setting problems.

Many modern machines have regulatory requirements that dictate maximum strength settings to maintain profitability while still allowing occasional wins. Test with various prize weights and sizes; a well-calibrated machine should handle different objects appropriately. Listen for unusual sounds during operation which might indicate mechanical issues affecting grip strength.

Remember that perfect calibration balances player satisfaction with business needs - machines that never award prizes frustrate players, while those that award too frequently affect profitability. Regular maintenance and occasional recalibration ensure consistent performance. If you suspect incorrect settings, consult your machine's manual or contact the manufacturer for proper adjustment procedures rather than attempting modifications yourself, which might violate warranty terms or local regulations.