greifbar
within reach
So close that you can reach it with your hand and touch it; touchable.
Bitte lege die Fernbedienung in greifbare Nähe.
Please put the remote control within reach.

tangible / within reach
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within reach
So close that you can reach it with your hand and touch it; touchable.
Bitte lege die Fernbedienung in greifbare Nähe.
Please put the remote control within reach.

The word consists of the stem of the verb 'greifen' (to grab/reach) and the ending '-bar'. The ending '-bar' often means 'can be ...', so 'greifbar' is literally something that can be grasped.
Die Werkzeuge sollten für den Handwerker immer greifbar sein.
The tools should always be within reach for the craftsman.
In the literal meaning, 'greifbar' is very often used in the fixed expression 'in greifbarer Nähe' (within easy reach). This means that something is very close.
Stell das Glas bitte in greifbare Nähe, damit ich es erreichen kann.
Please put the glass within reach so I can get to it.
You can recognize the figurative meaning 'clearly perceptible' by the fact that 'greifbar' is combined with abstract nouns such as 'Spannung' (tension), 'Angst' (fear), 'Erleichterung' (relief), or 'Atmosphäre' (atmosphere).
Die Erleichterung nach der Prüfung war im ganzen Raum greifbar.
The relief after the exam was tangible throughout the room.
To express that a goal or event is very close in time, the fixed expression 'zum Greifen nah' (within reach) is used.
Der Urlaub ist schon zum Greifen nah, nur noch zwei Tage arbeiten!
The vacation is already within reach—only two more days of work!
near / close
'nah' and 'greifbar' can both express that something is not far away. 'nah' is more general and works for places, times, and distances. 'greifbar' is stronger: it often means that something is so close you can almost reach it with your hand. Figuratively, 'greifbar' is also used when a goal or event has almost been reached. 'nah' simply says: not far away. 'greifbar' says: almost there or almost within reach.

Nach vielen Monaten Arbeit ist der Abschluss endlich greifbar.
After many months of work, completion is finally within reach.
Der Bahnhof ist nah, aber wir müssen uns trotzdem beeilen.
The train station is close, but we still have to hurry.