Features: 1. Used to measure diamonds and gold 2. Big LCD screen with backlight display 3. Automatic overload display 4. High resolution, fast response time, stable 5. Featured with calculated measurement mode 6. Featured with 4 different switchable measurement units 7. Auto zero tracking 8. Standard RS232 interface Specification: Model Capacity readable duplication linear pan size CT-50A 50ct 0.01ct +_0.01ct ≤+-0.02ct Φ80mm CT-100A 100ct 0.01ct ≤+_0.01ct ≤+_0.02ct Φ80mm CT-250A 250ct 0.01ct ≤+_0.01ct ≤+-0.02ct Φ80mm CT-500A 500ct 0.01ct ≤+_0.01ct ≤+_0.02ct Φ80mm