Type: Digital Coffee Concentration Refractometer ATC: 10-100C Environment temperature: 10-40 Minimum sample volume: 0.3 ml or more (2 ) Measuring time: about 1 second Battery: 1 AAA battery (not included) Size: 17cm in length, 10.5cm in width and 4.6cm in height Weight: 320.6 grams range: Brix: 0.00-30.00% TDS (coffee strength): 0.00-25.00 Environment temperature: 10-100 Resolution: Brix: 0.01% TDS (coffee strength): 0.01 Environment temperature: 0.1 accuracy: Brix: 0.20% TDS (coffee strength): 0.20% Environment temperature: 0.1 Colour:As shown Material:ABS Package Contents: 1 x Refractometers Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.