Impact resistant spirit level in yellow polystyrene plastic that will withstand temperatures between 15 c and 43 60 c unbreakable block vials with extremely high transparency and durability horizontal magnifying vial with luminous reflector easy clean surface sensitivity of 10 mmm with a 10 mmm tolerance in the normal position the vial fluid is a low viscosity coloured oil mixture that gives the bubble the best possible conditions for movement and is resistant to uv light and temperature