NEW: Long lasting LED lighting unit

Universal visual polarimeter is a visual circular polarimeter suitable for use in schools and teaching. The polarimeter has a circular scale divided into full degrees at ± 180 ° angles. When rotated together with the cursor scale, it can measure * * degrees of 0.1 °, and after a period of use, combined with user experience, it can be estimated by the user to achieve a reading of * * degrees of 0.05 °.

There are three different light sources to choose from:

• LED light source: LED is a type of very durable cold light source (with a lifespan of about 50000 hours).
• Halogen lamps: cheaper and have a longer lifespan than spectral lamps. Like LED light sources, it can be used immediately upon startup without the need for preheating.
• Spectral lamp: Using spectral lamp units can obtain light sources with higher and better precision wavelengths.

Sodium spectral lamps emit light of a limited wavelength (line spectrum). To eliminate unwanted side spectral lines, a filter should be used and must be inserted into the light source inlet.