I did not see the original posting. so forgive the reply to a reply.
When I was in grad school we used the Klett "spectrophotometer". It measured
light scatter at different wavelengths and was used to follow the growth of
microbial cultures eg bacterial (or mycoplasma in my case). You grew your
culture in a side arm flask and then inserted the side arm into the Klett
machine to take a reading. That way you could follow the growth of your culture
without having to open the flask or lose culture volume.
As I remember, the unit was calibrated to be 500 Klett units per 1 O.D.
I hope this helps.
In article <mantei-1411951645340001 at retrograde.ethz.ch>, mantei at neuro.biol.ethz.ch (Ned Mantei) writes:
> In article <48a9gs$hkg at surz03.HRZ.Uni-Marburg.DE>,
>doerner at papin.HRZ.Uni-Marburg.DE (Doerner Wolfgang) wrote:
>>> anyone out there who knows what a Klett-Unit is?
>> I used a Klett spectrophotometer as a student in the 1960's, and even then
> had the impression that the instrument was an old design (1940's?). The
> absorbance was indeed measured in "Klett units", but I don't know how many
> correspond to an O.D. unit.
> Ned Mantei
> Dept. of Neurobiology, Swiss Federal Institute of Technology
> CH-8093 Zurich, Switzerland
>mantei at neuro.biol.ethz.ch Fax: +41-1-633-1046