Fused Quartz Coverslip #No2

The listed 0.20 mm thickness is spot on, and the surface is perfectly clean right out of the box—no streaks or residue under my scope. It sits flat without any wobble, which is exactly what I needed for my fluorescence work.

I was worried about the thickness tolerance for my UV microscopy work, but these 0.20 mm quartz coverslips are perfectly uniform and transmit down to 185 nm without issue.

These fit my spectrometer setup perfectly and the optical clarity is noticeably better than the borosilicate slips I used before. Edges are clean with no chips, which matters when you're handling them with tweezers all day.