Applied toremote and shouting distancephase detecting, phase testing, phase sequence judgement and electrictity testing of the high voltage line,metalclad withdraw switchgear and ring main unit and others occasion. 1. Model : ETCR1560A 2. Phase Qualitative: Same phase:-20°~20°;Out of phase: 100°~140° and 220°~260° 3. Phase Range & Accuracy : 0°~360°;Accuracy:≤±8 ° 4. Frequency Range & Accuracy: 45.0Hz~65.0Hz;Accuracy:≤±2Hz 5. Transmitting Frequency : 433MHz, 315MHz 6. Host Power Supply : 3.7V, 2600mAh Rechargeable lithium battery