Category: Sphygmomanometer
Estimated Date: 1925
Name: Tonometer nach Dr. Von Recklinghausen, Mittlere Modell
Manufacturer: Bosch and Speidel

Description: 5” x 5” x 2 1/4” pine box with a leather handle contains a 4 1/4” x 1 1/2” white metal circular gauge labelled as above with calibration to 400 cm H20 and a conversion table to convert from cm H20 to mm Hg in the lid. The box has a brass leg built in to allow the user to tilt it for easy viewing. There is a knob to zero the dial and an outlet for connection of a rubber tube to a blood pressure cuff.