AND Newton EJ [EJ-3000] Portable Precision Balance with External Calibration, 3100g x 0.1g  - 127 × 140 mm . The AND Weighing EJ-3000 Newton EJ Portable Balance 3100 g x 0.1g is affordable that offers flexible and practical performance. The EJ3000 smartly optimizes counting accuracy with "ACAI" that auto improves accuracy throughout your counting procedure. The EJ3000 external calibration switch and gravity acceleration correction keeps you accurate and precise.