AND Newton EJ [EJ-4100] Portable Precision Balance with External Calibration, 4100g x 0.1g  - 127 × 140 mm . The AND Weighing EJ-4100 EJ Portable Balance 4100 g x 0.1g is affordable that offers flexible and practical performance. The EJ4100 smartly optimizes counting accuracy with "ACAI" that auto improves accuracy throughout your counting procedure. The EJ4100 external calibration switch and gravity acceleration correction keeps you accurate and precise.