AND Newton EJ [EJ-3002] Portable Precision Balance with External Calibration, 3100g x 0.01g - 127 × 140 mm. The A&D Weighing EJ-3002 Newton EJ Portable Balance 3100 g x 0.01g is affordable that offers flexible and practical performance. The EJ3002 smartly optimizes counting accuracy with "ACAI" that auto improves accuracy throughout your counting procedure. The EJ3002 external calibration switch and gravity acceleration correction keeps you accurate and precise.