1.ECG cliper/Heart Rate ruler, medical ruler 2.Good promotional gifts 3. ... is available 4. Material: PVC Item name: ECG cliper/Heart Rate ruler, medical ruler, promotional ruler, promotional giftsMaterial: PVC Size ... : 163*130MMFunction: used to measure Heart Rate, Wave Amplitude, P-R, QRS, Q-T intervalsMOQ: 6 ... designs and logos are welcome. ECG cliper/Heart Rate ruler