To show Expansion and contraction of a metal, a casted brass gauge with wooden handle, sliding fit over ends of bar and with hole in both arms, and a mild steel bar 100 x 10 mm with wooden handle.
Features
The 24 pc sets include: 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70 and 80 diopters.
Phorias & squints - which can improve the accuracy of your estimations & monitoring.
Fusional reserves :- which can help in your diagnosis of binocular vision problems.
The prisms are fitted accurately so that it will be easy to take and put, easy to carry as light weight.