Below is a light meter comparison of all G & R Labs’ UV light meters.
| Features | Model 100 | Model 200 | Model 202 | Model 220 | Model 221 | Model 222 | Model 325 | Model 410 | Model 511 |
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| Dual Range |  |
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| Measurements | |||||||||
| mw/cm2 | |
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| w/cm2 | |
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| mj/cm2 | |
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| Two Sensor Probe | |||||||||
| Channels A & B | |
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| Displays | |||||||||
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| Accumulated mj/cm2 | |
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| Peak mw/cm2 | |
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| Time | |
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| Scanned mw/cm2 | |
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| Scanned mj/cm2 | |
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| Calculates 5 measurements | |
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| Calculates 9 measurements | |
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| Calculates 11 measurements | |
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| Average mw/cm2 | |
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| % Uniformity from center | |
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Max,Mid,Min points | |
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| % Deviation from center | |
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| Rechargeable Battery | |
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| Computer Interface | |
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