User Manual
HydroGuage
Manometer
Gas Pressure Guage
No. HG15
INDUSTRIAL
Instruments
No. HG15 
U P C 41225
FILLS LIKE A
WATER GLASS
No more 
troublesome 
air bubbles
MAGNETIC
MOUNTING
DIRECT READING
No Plus or Minus
read ings to add
together as in 
old fashioned 
“U” tube
• Measures gas pressure easily and
efficiently
• Direct reading, no plus or minus readings
to add together as in old fashioned 
U-tubes
• Replaces ordinary U-tube manometers
• Fills like a glass of water, 
no more troublesome air bubbles
• Strong magnet for mounting
• Heavy-duty construction
• Made of industrial grade, 
flexible PVC plastic
• Lightweight
• Easy to use
• No assembly required
SPECIFICATIONS:
• HG15 water column height: 15"
• Plastic: 30" to 36" of industrial grade
flexible plastic
• Hose fitting: All brass
• Includes: Mounting magnet
6
81035 41225
1
Avoid injury: Always wear OSHA/ANSI approved eye
protection (goggles, face shield) when using tools. 
www.generaltools.com
Made in China 
©2009 GENERAL TOOLS & INSTRUMENTS
™
New York, NY 10013
Montreal, Canada H9R 1E1
• Measures gas 
pressure easily 
and efficiently
• Direct reading, 
no plus or minus 
readings to add 
 together as in 
old fashioned 
U-tubes
• Replaces ordinary 
U-tube manometers
• Fills like a glass 
of water, no more 
 troublesome 
air bubbles
• Strong magnet 
for mounting
• Heavy-duty 
construction
• Made of industrial 
grade, flexible 
PVC plastic
• Lightweight
• Easy to use
• No assembly 
required
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