Impact resistant polystyrene plastic level that will withstand temperatures between 15 c and 43 60 c unbreakable highly transparent and durable block vials with a luminous reflector on the horizontal vial it also has a v groove to enable use on pipes sensitivity of 10 mmm and a tolerance in normal position of 10 mmm 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 fluctuation