Bausch & Lomb Spectronic 20


Spectronic 20

The Spectronic 20 was introduced by Bausch & Lomb in 1954. This single beam spectrophotometer is well known for its enduring design and reliability. It can be used to determine what is in a solution by taking a spectrum (the pattern of how much light is absorbed at each particular wavelength vs. wavelength). More commonly it is used to determine the concentration of substances in solution by comparing the amount of light absorbed at a particular wavelength as compared to a standard of known concentration.   
Spectronic 20
Optics Single Beam
Wavelength Range 340 to 600 nm
Additional Specifications Mirrored Scale: 5 1/2 in   
Rapid Warmup: 5 min


Built in Fan: Cools Sample Compartment, Assures Stable Readings


Manuals and Resources

Note: We appreciate the support of individuals and companies making their documents and resources available to our community. If you find a document or resource that does not belong please let us know by emailing

Instrument Documents

Picture of Bausch & Lomb Spectronic 20
Bausch & Lomb was founded in 1853. With respect to laboratory equipment, Bausch & Lomb's specialty is spectrophotometers.    Bausch...

More about Bausch & Lomb

Visit Bausch & Lomb

Questions and Answers

Recent Question Activity

Ask a Question

spectrum or prism is not working

I have an old spec 20 and I cannot see the colors of light when I put a sample in the well.

B&L Spectronic 20 electrical schematic

This is a spotless unit S/N 33-24-61-64, but is overheating.  Tubes and filter cap are OK. If anyone has seen an electrical schematic, I'd appreciate locating one.  Any phototube model would be OK as they probably didn't change...

Broken or not using correctly?

I just purchased two Spec 20s for my school on Ebay. Once received, they are both working proprly on longer wavelengths (anything in red on the dial.) Unfortunately, at shorter wavelengths, I cannot get them to 100% Transmittance. I am using optical...

See all 12 Bausch & Lomb Spectronic 20 Questions and Answers There are 12 Threads


Member Reviews

There are no threads in Bausch & Lomb Spectronic 20 Reviews at this time.
Add a Review

Buy it Used!

Used Bausch & Lomb Spectronic 20 Offerings on LabX