Nice little botanist’s magnifying glass in a solid metal housing. 10x magnification and lens diameter of 18 mm. However, the visible (active) part of the lens is 15 mm in diam. Supplied in a practical small plastic box.

Are the hands clean after washing?

Let the students apply fluorescent cream around their hands before they are washed and held under UV light. Where the soap has not been rubbed in properly, the UV light will reveal bright, blue fluorescent spots. 240 ml in tube.