1950's Berens-Tolman Ocular Hypertension Indicator Gulden Co. Tonometer Collect

Description

1950's Berens-Tolman Ocular Hypertension Indicator Gulden Co. Tonometer
The Berens-Tolman Ocular Hypertension Indicator was invented in 1950 by Conrad Berens and Charles P. Tolman.
Its patent number indicates a 1953 patent.
It is a screening instrument to indicate whether the intraocular pressure is below or above normal
The indicator uses the footplate and plunger like those seen on the Schiötz tonometer.
The weights of these parts correspond to the Schiötz tonometer. 20 mm hg,
The reading is an indication and not an absolute number.
The instrument is about 6.5 cm long
It is inscribed – Berens Tolman Ocular Hypertension Indicator CP Tolman US Pat 2.656.715 RO Gulden Phila
Instrument comes in its original plastic container (minus top).
Includes original instructions for use
HOSH2A