Optical Screen with Hole/Pointer this Test Tube Rack is

this Test Tube Rack is resistant to corrosion and can be sterilized at high temperatures up to 121°C

allowing the organism to withstand harsh environmental conditions

conforming to BP (British Pharmacopoeia) and USP (United States Pharmacopeia) standards

and selenium

Optical Screen with Hole/Pointer this Test Tube Rack isVersatile Design: The Optical Screen with Hole Pointer offers a dual functionality as both an object and receiving screen. Metal Frame Construction: The sturdy black metal frame measuring 150 x 100 mm comes with an aperture and index point. Removable White Card: The included white card screen features an aperture, allowing it to be used as an object, or inverted as a receiving screen. Practical Base: Mounted on a solid base measuring 100 x 50 mm for