When selecting a 15t hydraulic press, you must prioritize the frame construction, typically choosing between H-frame (for stability) or C-frame (for accessibility). Ensure the piston stroke length meets your specific application needs, and verify that the working pressure does not exceed the rated capacity to ensure longevity. Additionally, check for high-quality hydraulic seals (such as those from brands like SKF or NOK) to prevent oil leakage, and ensure the pressure gauge is glycerin-filled for accurate, vibration-resistant readings.