The USGS Electric Tape Gage is used primarily as
an inside reference gage (base gage) over a stilling
well. An electric tape gage consists of an aluminum
frame holding a voltmeter, a reel to hold steel
tape, and a base to bolt the assembly to a tabletop.
A battery of less than 6 volts is required, but not
The weight is lowered until is contacts the water
surface; this contact completes the electric circuit
and produces a signal on the voltmeter. With the
weight held in the position of first contact, the
tape reading is observed at the index provided on
the reel mounting.
electric tape, without tape
801-144 Tape, 25
ft. 0.3 lb.
801-145 Tape, 50
ft. 0.4 lb.
100 ft. 0.5 lb.
801-140 Tape, 10
m. 0.3 lb.
801-141 Tape, 20
m. 0.4 lb.
801-142 Tape, 30
m. 0.5 lb.