Demonstration Spherometer Subcategory_Weights and Masses Locking control at any extension

Locking control at any extension on this two-meter retractable tape measure

supplying replacements when the originals lose loft or split during repeated charging cycles

the moderate curvature spreading light gently for divergence and virtual-image-formation work in refraction demos

gripping objects up to 90 mm and mounting to support rods up to 15 mm for chemistry and physics setups

Paired safety-socket outputs deliver two selectable ranges 0-70V and 0-125V DC at 300mA

Demonstration Spherometer Subcategory_Weights and Masses Locking control at any extensionDemonstration spherometer with an oversized 133 mm dial head and baked enamel finish, letting an entire classroom read spherometer values before students work with benchtop units.