Backed by ESECO’s established ONE YEAR “NO HASSLE” WARRANTY, makes the Speedmaster SM-14 the ideal cost-effective choice for reading film on a viewer.

• – Measuring Range: 0.00 to 4.00 D
• – Accuracy: ± 0.02 D / Repeatability ± 0.01 D
• – No Warm-up Time
• – Portable Power Source: 9-volt Alkaline Battery Included
• – Weight: 5.9 oz. / 167.2 grams
• – Dimensions Height: 2.5 Inches (6.35 cm) / Width: 1.5 Inches (3.81 cm) Length: 4.75 Inches / (12.06 cm)