About AstroAI. Portable Design: Compact size (13 x 7.3 x 3.7 cm) and lightweight (150g) for easy portability. 3½ digit (1999 count) LCD with backlight for visibility in dim areas. Clear Display: Large 0.6" backlit LCD with 3½ digit display (1999 count) shows positive/negative readings clearly.
eBay