This is a Safe Flight Instrument Corporation Part Number 1960 or a 1960-4-5-7 Force Application Kit used to measure the lift transducer for the stall warning tab on the leading edge of aircraft.
1960-4-5-7 Safe Flight 1960 LIFT TRANSDUCER FORCE APPLICATOR TEST SET used
The First Gage measures 0 to 30 Grams
The Second Gage measures 0 to 50 Grams
The First Gage measures 0 to 250 Grams
Includes the original case and instructions as shown as well as the parts book break down.