AND Newton EJ [EJ-410] Portable Precision Balance with External Calibration, 410g x 0.01g - 110mm . The AND Weighing EJ-410 EJ Portable Balance 410g x 0.1g is affordable that offers flexible and practical performance. The EJ410 smartly optimizes counting accuracy with "ACAI" that auto improves accuracy throughout your counting procedure. The EJ410 external calibration switch and gravity acceleration correction keeps you accurate and precise.