1.ECG cliper/Heart Rate ruler, medical ruler 2.Good promotional gifts ... 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: ... ' designs and logos are welcome. ECG cliper/Heart Rate ruler