 
            Walchem
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Two versions are available for both cooling tower and boiler system applications. Simple to operate, the Handheld Little Dipper is a perfect tool for system verification.
| Parameter | Specification | 
| Linear Range 
 | 0-200 ppb typical for fluorescein 0-200 ppb typical for PTSA | 
| Sensitivity | 1ppb typical for fluorescein and PTSA | 
| Temperature | 41 - 104°F (5 - 40°C) | 
| Warm-up time | 5 seconds | 
| Case | IP67 standard: dustproof/waterproof | 
| Power | 2 AA batteries | 
| Light source | LED | 
| Detector | Photodiode | 
| Weight | 4.3 oz (120 kg) | 
| Size | 8.9”x 2.0”x 1.75” (22.6 cm x 5.1 cm x 4.5 cm) |