Specification: Tips: 1. The instrument does not have PH detection function 2. Grape juice that is too dark cannot be detected 3. Liquids cannot be transported by air, and standard calibration solutions are not included with the product Specification: 20B: Measuring range: 0-20 NTU Indication accuracy: 0.01 NTU Indication error (basic error): ±8% 50B: Measuring range: 0-50 NTU Indication accuracy: 0.01 NTU Indication error (basic error): ±6% 200B: Measuring range: 0-200 NTU Indication accuracy: 0.01 NTU Indication error (basic error): ±6% 200BS: Measuring range: 0-200 NTU Indication accuracy: 0.1 NTU Indication error (basic error): ±6% 400B: Measuring range: 0-400 NTU Indication accuracy: 0.01 NTU Indication error (basic error): ±6% 10000BS: Measuring range: 0-400, 400-1000 NTU Indication accuracy: 0.1 NTU Indication error (basic error): ±6% Power supply: 4 AA batteries/6V power adapter (need to bring your own) Measuring principle: 90° scattered light Stability of indication: ±1.5% (F.S 30min) Zero drift: ±1.5% (F.S 30min) Repeatability (linear error): ≤2% Size: 31.5*21.5*8.5cm Because manual measurement may have an error of 1-2cm, I hope you can understand. Contact us: If you have any questions or needs, you can contact us at any time.