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✓Fast speed and zero delay for key response
✓Built-in Battery, Low power dissipation and long stand-by time
✓Signal tester: rational key layout, all functions have independent corresponding keys, which are easily to be operated
✓Self-protection signal generator: built-in one-time quick-break fuse can avoid instrument damages caused by misinserting electric supply with 110V or 220V
✓High quality calibrator: some key chips such as DA, reference voltage and operational amplifier adopts stable chips with high temperature and high temperature, to improve temperature stability of instrument and long-term aging performance index