![Variable Frequency Targets](https://productimages.edmundoptics.com/1541.jpg?w=305&quality=80)
- 5 lp/mm to 120 lp/mm or 5 lp/mm to 200 lp/mm
- 1mm Wide Step Size
- 5 lp/mm Step Increments
- Used to Calibrate Video Systems
- Inspect Unknown Resolutions
![Precision Ronchi Ruling Glass Slides](https://productimages.edmundoptics.com/1524.jpg?w=305&quality=80)
- Used for Evaluation of Resolution, Field Distortion, and Parfocal Stability
- Ideal for Reticle and Field Calibration Requirements
- Available on Float Glass, Fused Silica, Fused Silica with Fluorescent Backing, and Opal.
![High Precision Ronchi Rulings](https://productimages.edmundoptics.com/2233.jpg?w=305&quality=80)
- Chrome on Glass
- High Tolerance
- Superior to Etched and Filled Rulings
- Lines Parallel to Edge
- English and Metric Versions Available
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