By placing the point gently on the surface of the skin, different nerve endings are stimulated. To maintain accuracy during placement, a grid stamp is available. You simply ink the stamp with washable ink and press it on the area of skin to be measured. To locate the grid accurately measure from a standard location such as the middle knuckle or a vein. I have data sheets in my office which makes recording the data easier.
Several weights are available for the algisimeter.
Simply unscrew the end weight and add or remove additional weights. This is a classic demonstration in the sensation of color. The motor can be adusted to rotate at different speeds to see the effect on the illusion. They are effective if the room is already quiet. Students have used them in sensory deprivation studies, attention studies, and modality studies.