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Auto Power off 

1. Auto power off: approx. 10 minutes. 
2. After auto power off, press (RANGE) button to   

restart the meter, and the last reading of 
measurement will appear in the display. 

 

Cancellation Of Auto Power Off Feature:   

Press and hold the (RANGE) button while moving 
slide switch from off to any position to turn on the 
meter . The auto power off feature is disabled. 
Note “APO” indicator is missing from the LCD. 
 

Cleaning 

Wipe the case with a damp cloth and mild 
detergent. Do not use abrasives or solvents. 
Dirt or moisture in the terminals can affect 
readings. 

 
 
 
 
 
 
 
 
 

 
 

Summary of Contents for PRO-57

Page 1: ...PRO 57 Tweezer Digital Multimeter OPERATING INSTRUCTIONS...

Page 2: ...easurements Do not touch exposed metal pipes outlets fixtures etc which might be at ground potential Keep your body isolated from ground by using dry clothing rubber shoes rubber mats or any approved...

Page 3: ...ond nominal Auto power off approx 10 minutes Operating environment 0 to 40 32 104 at 70 R H Storage temperature 20 to 60 4 to 140 at 80 R H with battery removed from meter Temperature Coefficient 0 1...

Page 4: ...0 range Overload protection 30VDC or 30AC RMS CAPACITANCE Ranges 3nF 30nF 300nF 3 F 30 F 300 F 3mF 30mF Resolution 1pF Accuracy 3 0 rdg 10 dgts on 3nF to 300 F ranges 5 0 rdg 20 dgts on 3mF to 30mF ra...

Page 5: ...le warning 0 03V Overload protection 30VDC or 30AC RMS OPERATION Before taking any measurements read the Safety Information section Always examine the instrument for damage contamination excessive dir...

Page 6: ...so works as an on off button Depress the button for more than 2 seconds to shut down the meter Depress the button again for more than 1 second to wake up the meter If the meter is turned off with the...

Page 7: ...1 Set the function to or position 2 Turn off power to the circuit under test External voltage across the components causes invalid readings 3 To toggle between the ohms continuity diode modes press M...

Page 8: ...on to position 2 Touch the probes to the capacitor Observe polarity when measuring polarized capacitors 3 Read the capacitance directly from the display 4 Discharge the capacitor before taking capacit...

Page 9: ...y Cancellation Of Auto Power Off Feature Press and hold the RANGE button while moving slide switch from off to any position to turn on the meter The auto power off feature is disabled Note APO indicat...

Page 10: ...d period of time Power is supplied by a 3 volt button type lithium battery x1 CR2032 appears on the LCD display when replacement is needed 1 Set the Function Switch to OFF 2 Remove battery cover screw...

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