Category: Pulse
Estimated Date: 1910
Name: Plethysmo-Sphygmo-Oscillometre
Manufacturer: E. Spengler

Description: 4×4×2” red velvet lined black box contains a fitted metal oscillimetre on the bottom. Nickle plated, callibrated from 0 to 20. The scale is oval shaped and there is a knob to turn it on and off and an input for the cuff. Spengler is printed on the lid inside and there is a paper instruction label.

Reference 1: 432