The Hultafors ELV 40 Spirit Level for electrical installations. The C-shaped aluminium profile has plastic end pieces and rubber spacers protecting and prevent the spirit level from sliding on the measuring surface. Sliding markers with graded 71mm centre spacing, allows for quick and accurate positioning when installing switch or junction boxes according to DIN 49075. The focus vial features colour markings for easy reading and a 200mm radius giving a sensitivity of 10 mm/m. The liquid in the vial is a low viscosity coloured oil mixture giving the bubble optimal freedom of movement. Its also anti-static, so the bubble is not affected by static electricity. Tolerance in normal position is ±0.5 mm/m, upside down ±0.75 mm/m.