These tubes are made from special tubing to give the optimum wall thickness. They are well annealed, resistant to heat and chemically stable. Rims are fire-polished. The 25mm tube does not have a marking spot.
Approx. O.D. x Length mm:
Physics Atomic & Nuclear Electron Tubes Student Tubes - C-9800-25X - Beaded Rim Test Tube 25x200 192/ca
100% Satisfaction Guarantee: At Mansion Labs, we want to be sure that the item you choose is the right one for you. Within 30 days of delivery of your order, you may return any merchandise purchased from Mansion Labs in its original condition with your email order confirmation or packing slip. Restocking fees may apply. On items over $275 shipping within the US, we will even arrange free pick up or pay for returns shipping.