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The DSP4 could simultaneously display up to four real-time values along with user-defined labels. Data values and labels were illuminated for easy visibility in daylight conditions. The DSP4 was primarily used in vehicle test/industrial applications.
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				The DSP4 Heads-Up Display was retired on September 17, 2008.
Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.
| Product | Compatible | Note | 
|---|---|---|
| 21X (retired) | ||
| CR10 (retired) | ||
| CR1000 (retired) | ||
| CR10X (retired) | ||
| CR200X (retired) | ||
| CR206X (retired) | ||
| CR211X (retired) | ||
| CR216X (retired) | ||
| CR23X (retired) | ||
| CR295X (retired) | ||
| CR3000 (retired) | ||
| CR500 (retired) | ||
| CR5000 (retired) | ||
| CR510 (retired) | ||
| CR800 (retired) | ||
| CR850 (retired) | ||
| CR9000 (retired) | ||
| CR9000X (retired) | 
| Operating Temperature Range | -40° to +80°C | 
| Dimensions | 33.0 x 8.4 x 7.1 cm (13.0 x 3.3 x 2.8 in.) | 
| Weight | 1.7 kg (3.7 lb) |