Eisco Labs Premium Spectrum Tube - Water Vapor (H2o), 26cm

• Effectively demonstrate the spectral lines of water vapor
• 26cm long tube is designed to provide a greater viewing area
• Made of high-quality transparent soda glass - Built to last and withstand long time use
• For use with spectrum tube power supply, available separately
• Includes instructions

This high-quality Spectrum Tube effectively demonstrates the spectral lines of pure water vapor when placed in a spectrum tube power supply (not included). It is designed for use with power supplies capable of holding 26cm spectrum tubes (Eisco p/n ESRPH1197B). The 26cm long tube is made of durable, transparent soda glass and features a large 10cm capillary in the center for greater viewing area. For best performance and longest life, the spectrum tube should be operated in 30 seconds on / 30 seconds off time intervals. Includes instructions.

NOTE: For intermittent use only, not to be used as a lamp source. Expected life of spectrum tubes will vary depending on the gas they contain. If the tubes are used as recommended and not allowed to overheat, the useful life - or time it takes to detect contamination with the usual measuring equipment - is very long.