HELLMA｜Abs Calibration Standards
Model :
666-F2、666-F3、666-F4、666-F202、666-F203、666-F301、666-F303
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Model |
F2 |
F3 |
F4 |
F7 |
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Description |
Neutral density glass filters |
Didymium glass filter |
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Used range |
Checking the photometric accuracy (absorbance) in the visible range (440 nm to 635 nm) |
UV region (270 nm to 340 nm) |
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Material |
NG 11, SCHOTT |
NG 5, SCHOTT |
NG 4, SCHOTT |
Glass BG 36 |
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Regulatory |
USP, ASTM |
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