Manual
Instruction 
Manual
SubSurface Instruments Inc.
GAIN
SSI
BATT
Signal Strength and Polarity (-) or (+) are indicated by the 
two opposite-facing bar graphs. The signal indications 
start in the center-most short bars and fill outwardly in 
increasingly larger bars as the signal increases, until 
maximum strength is reached.
Polarity is indicated by which set of bars are being filled: (-) 
Negative or (+) Positive Side
The Gain Setting in the lower left hand corner is the “GAIN” 
bar graph, indicating from left (low) to right (high). By 
raising the gain, the locator will become more sensitive to 
a weaker target.
The Battery Icon in the lower right corner only appears 
when the batteries are getting low. The shape of a battery 
appears when the batteries are very close to needing   
replacement. Once this starts flashing, only about 5% of 
the battery life remains. Always carry spare batteries in the 
carrying case and be prepared to replace batteries when 
the battery symbol appears. Extensive use of high volume 
settings will reduce battery life.
Magnetic Locator
ML-1
ML-1M
Instruction 
SubSurface Instruments Inc.
Magnetic Locator
Magnetic Locator
ML-1M
ML-1M
GAIN
ON
OFF
VOL
GAIN
ML-1 KEYPAD
Power On/Off: Press this button to turn the unit ON or OFF
Speaker Volume: is controlled by pressing and holding down 
the ON/OFF button. It will cycle from “Low” through “High.” 
Repeat the cycle until the button is released. Release the 
button at the desired volume.
Gain (Sensitivity) Control Down and Up: 
Depress the button with the “DOWN ARROW” to decrease the 
sensitivity and depress the “UP ARROW” button to increase 
the sensitivity. One click at a time.
Microprocessor Controlled: The Volume and Gain setting 
are set in processor memory. When the unity is turned off, it 
remembers the last settings, so that when you turn on the unit 
again, it will already be adjusted to your previous settings.
Battery Compartment
Loosen the Captive Screw located on the bottom of the 
electronics box and remove the cover. Two 9-volt battery slots 
are provided. Since there are no “snap” connections to make, 
be sure the batteries are placed in the correct “polarity”.
SubSurface Instruments Inc.
1841-C Plane Park Drive
DePere, WI 54115
Phone: 1-877-I CAN FIND IT • Fax: 920-347-1791
www.SSILocators.com • Info@SSILocators.com
(1-877-422-6346)


