This model(RHF-30ATC) is specially for testing the water level in the honey, measuring tool for bee keeper. Specifications: Automatic Temperature Compensation (ATC) Length : 140mm Weight: 230g Heavy Duty Approved by strict quality and safety standards Durable and built to last long Heavy-duty and lightweight with its aluminum construction Easy to focus and calibrate Accurate testing results guaranteed Made with the highest and finest quality of aluminum & rubber that makes it lightweight Cushioned with soft & comfortable non-slip rubber Extremely easy-to-use and calibrate Noted Please: All our refractometer have been calibrated before shipping,please feel free to use it. Please don't drop the oil directly on the daylight plate,please open the daylight plate and drop the oil on the prism. Attention: When using the calibration oil and stone from our factory to calibrate the Refractometer: The dioptric oil can attack the daylight plate (all plastic and rubber), please keep it away from the daylight plate as much as possible. With repeated contact, the dioptric oil can cause cracking and fogging of the daylight plate. When you do the calibration, the calibration stone (refractometer block) must be used and it will act as daylight plate. MOST IMPORTANT: Please keep the dioptric oil away from CHILDREN!
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