I think it's time to let go of the chalk line and get a Laser! – MaxTool
BOSCH GLL3-330CG Green Beam 3 Plane Laser with 12-Volt Rechargeable Battery - Contractors-Tools.com
Bosch Professional 12 V System Laser Level GLL Lines 3-80 CG (without battery and charger, green laser, with application function, range: up to 30 m, support BM 1, L-BOXXX) : Amazon.com.be: Tools