Which is the best pen for UPSC Mains?

I had almost narrowed down on pilot v5 as the best pen over, considering the nib size and the speed that it gives. 

And then one fateful day, water spilled over my notes, and everything was gone. 

NEVER USED PILOT PEN AGAIN. CAN'T RISK USING A NON-WATERPROOF PEN TO WRITE MAINS. 

Slips from my hand, just like butter 🤣🤣

How come Pilot V5 works for everyone? It stops working after 1-2 days. Tried from different shops and online too.

Started using Trimax and pentonec gel pen, hoping it won't stop working. 

Pilot G2 (easily available)

Add Achiever (can get in offline store)

tried uniball air once, writing speed was good but thickness is inconsistent

Uniball

• Stronger nib than pilot(quite sensitive eh) and lasts longer
• Waterproof
• Consistent ink flow from start to end
• Refillable version replaces nib too(like trimax refill), unlike Pilot Cartridge where whole pen is useless if your nib is destroyed. 

People looking for cheap alternative to Uniball eye can check Uniball Refillable 215. It has same roller tech and nib used in eye and refill costs 25/-. 

Uniball air is one of the best. But too expensive. 

Exactly what I was looking for. 

Thanks for the suggestion. 

Not for me. Pilot V5 failed me or may be I failed Pilot V5. 
It's Hauser Sonic Gel since then. What a pen!

Any left handers recommendations? Honestly most gel pens and V5 are quite useless if you’re left handed. I used a V7 for the mains, but I really want a waterproof pen that writes with moderate thickness and gives decent handwriting (which is a steep ask as a left hander)

Trimax worked well for me. Specially to make the handwriting legible. Worth a shot!