Riester Duplex baby stethoscopeis a high-grade quality product from the Riester company. The stethoscope with double chest-piece was especially developed for babies and children. Considerably improved acoustics. The particularly light precision chest-piece of Riester Duplex baby stethoscope is made of aluminium. Special membrane, 36 mm, with particularly flat and soft non-chill rims for improved adaptation on the skin. Bell, 28 mm.Overall length: 76.5 cm. Frequency analysis:20 Hz 100 Hz max. 3.85 dB at 100 Hz100 Hz 1,500 Hz max. 14.3 dB at 300 Hz Riester Duplex baby stethoscope is supplied with a pair of replacement ear-tips and a replacement membrane.