1.ECG cliper/Heart Rate ruler, medical ruler 2.Good promotional gifts 3. Logo printing ... 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: 6,000 ...