Spectra Precision 1237 Metric Invert Plate The Spectra Precision 1237 Metric Invert Plate is a durable pipe laser alignment accessory designed for accurate invert elevation and grade setup in underground utility and pipeline installation applications. Featuring metric graduations, it helps support precise pipe alignment and consistent grade control in trench and manhole environments. Key Features • Designed for accurate invert elevation measurements • Metric graduations for precise grade and alignment setup • Ideal for pipe laser and utility installation applications • Durable field-ready construction for underground use