User Manual
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  toward you.
2. Grasp the tip and gently turn it counterclockwise until it separates 
  from the probe body.
3. Replace the old tip with a compatible new tip (included) and reverse 
  Steps 1 and 2. NOTE: Do not overtighten the tip.
Replacing the Battery
Net Toner – When battery power runs low, the LOW BATT LED on the 
  Net Toner will light. 
Net Probe — When the battery needs to be replaced, the LED indicators 
  will dim and the speaker sound will weaken or fail.
NOTE: When a low battery is indicated on either unit, change the battery 
immediately, as continuing to test with a low battery may produce 
inaccurate results. Both units require one standard alkaline 9 V battery. 
Slide back the battery cover to replace new battery.
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