Spotting an ISTP can be challenging as they often prefer to blend in and keep a low profile. However, there are certain characteristics and behaviors that can help you identify an ISTP:

1. Reserved and Observant: ISTPs are typically quiet and reserved individuals. They prefer to observe their surroundings and take in information rather than actively participating in conversations or social interactions. They may appear detached or aloof, often keeping to themselves.

2. Practical and Hands-On: ISTPs are highly practical and enjoy working with their hands. They have a natural inclination towards mechanics, engineering, and other hands-on activities. You may find them tinkering with gadgets, fixing things, or engaging in hobbies that involve physical skills.

3. Independent and Self-Sufficient: ISTPs value their independence and autonomy. They prefer to rely on themselves and are often self-sufficient in their actions and decision-making. They may resist authority or rules that they perceive as unnecessary or restrictive.

4. Adaptable and Spontaneous: ISTPs are known for their ability to adapt to new situations and think on their feet. They are quick problem solvers and can handle unexpected challenges with ease. They enjoy the thrill of spontaneity and may seek out new experiences or adventures.

5. Analytical and Logical: ISTPs have a strong preference for logical thinking and objective analysis. They are skilled at breaking down complex problems into manageable parts and finding practical solutions. They may come across as pragmatic and straightforward in their communication style.

6. Reserved Emotionally: ISTPs tend to keep their emotions private and may struggle with expressing their feelings. They prefer to focus on the present moment and practical matters rather than dwelling on emotions or engaging in deep discussions about personal feelings.

7. Risk-Takers: ISTPs are often drawn to high-risk activities or extreme sports. They enjoy the adrenaline rush and the challenge of pushing their limits. They may have a thrill-seeking nature and seek out experiences that provide excitement and stimulation.

8. Non-Conformist: ISTPs often have a rebellious streak and may resist societal norms or expectations. They prefer to follow their own path and make decisions based on their own judgment rather than conforming to traditional standards.

It's important to note that these characteristics are generalizations, and individuals may vary in their expression of personality traits. Additionally, it's always best to approach personality typing with an open mind and avoid making assumptions based solely on someone's behavior.