Description: Quality glass cuvettes. Be ussed to maintain reference and samplesolutions, suitable for spectroscopic instruments Widelyused in chemical, food, pharmaceutical, pharmaceutical, environmentalprotection, power plants, water conservancy, petroleum and otherindustries, research and analysis, laboratory use. Suitable for 721 photometer. Size of 5mm,10mm,20mm,30mm,40mm,50mm Specification: Material: glass 1: Inner size(L*W): approx. 5*11mm/0.2*0.43inch; external size(L*W*H): approx. 14.5*9*43mm/0.57*0.35*1.7inch 2: Inner size(L*W): approx. 10*12mm/0.4*0.47inch; external size(L*W*H): approx. 14*15*43mm/0.55*0.6*1.7inch 3: Inner size(L*W): approx. 20*12mm/0.79*0.47inch; external size(L*W*H): approx. 24*15*43mm/0.9*0.6*1.7inch 4: Inner size(L*W): approx. 30*12mm/1.18*0.47inch; external size(L*W*H): approx. 34*15*43mm/1.34*0.6*1.7inch 5: Inner size(L*W): approx. 40*12mm/1.57*0.47inch; external size(L*W*H): approx. 44*15*43mm/1.73*0.6*1.7inch 6: Inner size(L*W): approx. 50*12mm/1.97*0.47inch; external size(L*W*H): approx. 54*15*43mm/2.13*0.6*1.7inch Package Includes: 1 Piece Glass Cuvette