trial frame:
1. CE, RoHS certification
2. 10pcs PD adjustable range
3. very high quality but favorable price
trial frame SJ-300:
USAGES: | It is suitable for eyesight examination in spectacles shops, department of ophthalmology in hospitals, schools and enterprises. | FEATURES: | PD adjustable range (10 specification): 54mm56mm58mm60mm62mm64mm66mm68mm70mm72mm. | MAIN TECHNICAL INDEXES | 1Range of PD adjustments | 54mm∼72mm, pupillary distance of each specifcation of lens testing frame increase 2mm in turn. | 2Axial calibration on each disc | 165°∼0°∼180°∼25° axis graduation line runs counter clockwise along axis graduation line of lens frame, with interval of graduation line being 5°. | 3Inner diameter of lens frame
| Φ34mm | | 4The Number of lens which can be inserted into left or right lens frame simultaneously | 4 pieces | | 5Degree that front lens rotates around optic axis inside lens frame | 360° | | 6Non-parallelism degree between lens optical axis and lens frames geometric axis | ≤2.5° | | 7Non-concentricity between lens optical center and lens frame geometric center | ≤0.5mm | | 8Displacement of lens in relation to position of lens frame geometric center | ≤0.3mm | | 9Range of nose pad adjustment | up and down direction 4mm. | | 10Range of left or right lens frame legs length adjustment | 90mm∼99mm,length of specification of trial frame increase 1mm in turn. | | 11Maximum interval between left and right lens frame legs | 200mm | | 12Weight | 35.6g∼37.4g Weight of specification of trial frame increase 0.2g in turn. |
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