Diamond and gem gauge, digital (oblong)

Details Measure the stone, find a calculator, refer to the formula we give you, look up the gemstone (we give you constants for 16 gemstones), calculate the weight. SPECIFICATION Brand: unbranded, made in China Range: 0.01mm to 25.00mm Tolerances: unknown. I can only guess: (this is not a guarantee) ± 0.02mm. Accuracy: I'd guess (this is not a guarantee) it would be accurate to within 0.1mm when measuring 25mm (the error on smaller measurements would be less). Units: millimetres or inches Cuts: it will 'weigh' 12 different shapes Takes one size LR44 battery (included) - lasts 1 or 2 hours of continuous use.Measuring  Disclaimer All equipment and materials must be used in conjunction with the user's skill, knowledge and experience. Under no circumstances shall QUICKTEST be liable for direct or indirect loss sustained in connection with any item. It is your responsibility to regularly check equipment against known samples, to ensure that it is working correctly.