Straight switches and sockets at last (no need for double alignment). Time-saving, accurate installation of plug sockets and switches. With recess for screwdriver guide Suitable for all standard UP switch ranges. Ultra-strong rare-earth magnet aligns the spirit level on the socket almost automatically! Permanently cast spirit level. Sturdy plastic housing for daily use on construction sites. Measuring accuracy: 0.057° = 1 mm/m in normal position.