Description: Quality glass cuvettes. Be ussed to maintain reference and sample solutions, suitable for spectroscopic instruments. Widely used in chemical, food, pharmaceutical, pharmaceutical, environmental protection, power plants, water conservancy, petroleum and other industries, research and analysis, laboratory use. Suitable not only 721 photometer but also type of 722, 723, 752, 751, 754, 756, UV-1800, UV-2000, UV-2800, etc. Size of 5mm,10mm,20mm,30mm,40mm,50mm Specification: Material: glass #1: Inner size(L*W): approx. 5*10mm/0.2*0.39inch; external size(L*W*H): approx. 12.5*7.5*45mm/0.49*0.3*1.77inch #2: Inner size(L*W): approx. 10*10mm/0.39*0.39inch; external size(L*W*H): approx. 12.5*12.5*45mm/0.49*0.49*1.77inch #3: Inner size(L*W): approx. 20*10mm/0.79*0.39inch; external size(L*W*H): approx. 22.2*12.5*45mm/0.87*0.49*1.77inch #4: Inner size(L*W): approx. 30*10mm/1.18*0.39inch; external size(L*W*H): approx. 32.5*12.5*45mm/1.28*0.49*1.77inch #5: Inner size(L*W): approx. 40*10mm/1.57*0.39inch; external size(L*W*H): approx. 42.5*12.5*45mm/1.67*0.49*1.77inch #6: Inner size(L*W): approx. 50*10mm/1.97*0.39inch; external size(L*W*H): approx. 52.5*12.5*45mm/2.07*0.49*1.77inch Package Includes: 1 Piece Glass Cuvette Note: Customer satisfaction is our primary concern. If the product is somehow cracked or broken during shipping, please feel free to contact us. We will try our best to give you a satisfactory solution.