Planar flat crystal is a commonly used tool for measuring and checking the conformity and flatness of measuring surfaces such as block gauges, gauges, parts sealing surfaces, and measuring instruments by interference methods.
Planar flat crystal is used to measure the flatness error and research performance of high-gloss surface. Planar flat crystal has high precision flatness. Generally used alone, there are two types of single plane and double plane.
| Name | Diameter, thickness | Accuracy |
| Single plane | φ45*15 | Flatness＜0.1μm |
| Double plane | φ45*15 | Flatness＜0.1μm |
| Single plane | φ45*15 | Flatness0.03μm |
| Double plane | φ45*15 | Flatness0.03μm |
| Single plane | φ50*20 | Flatness0.03μm |
| Double plane | φ50*20 | Flatness0.03μm |
| Single plane | φ60*20 | Flatness0.03μm |
| Double plane | φ60*20 | Flatness0.03μm |
| Single plane | φ75*20 | Flatness0.03μm |
| Double plane | φ75*20 | Flatness0.03μm |
| Single plane | φ80*20 | Flatness0.05μm |
| Single plane | φ120*25 | Flatness0.05μm |
| Single plane | φ150*30 | Flatness0.05μm |
| Single plane | φ200*40 | Flatness0.08μm |
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