1、Aluminum body, sturdy and light weight. 2、Automatic temperature compensation (ATC) function. 3、Compact design with anti-slip rubber handle. 4、Equipped with a manual calibration knob, you can rotate it to focus the scale clear. 5、Soft eyepiece gives you great comfort while viewing. Features: 1. Aluminum body, sturdy and light weight. 2. Automatic temperature compensation (ATC) function. 3. Compact design with anti-slip rubber handle. 4. Equipped with a manual calibration knob, you can rotate it to focus the scale clear. 5. Soft eyepiece gives you great comfort while viewing. 6. No batteries or power supply are required. Specification: Model: RZ115 Measurement Range: Ethylene Glycol: -50℃ ~ 0℃ Propylene Glycol: -50℃ ~ 0℃ Cleaning Fluid: -40℃ ~ 0℃ Battery Fluid: 1.10  - 1.40sg Material: Aluminum & ABS Color: Black + Silver Size: 156*40*40mm / 6.1*1.6*1.6in Weight: Approx. 236g/8.3oz Package list: 1 * Antifreeze Refractometer 1 * Pipette 1 * Mini Screw Driver 1 * Wiping Cloth Note: 1. Due to the difference between monitors and light effect, the pictures may not reflect the actual color of the item. Please take the real one as standard. 2. Please allow slight error due to manual measurement. Thanks for your understanding.3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.