Cen-Tech Automotive Meter 95670 Manual

The Cen-Tech Automotive Meter 95670 is a versatile digital multimeter designed for automotive diagnostics and general electrical testing. It features multiple measurement functions including DC/AC voltage, DC/AC current, resistance, continuity, diode test, and transistor hFE. With a large LCD display, overload protection, and included test leads, it's suitable for troubleshooting automotive electrical systems, household circuits, and electronic components. Below are key sections for safety, features, operation, specifications, and troubleshooting.

1. Features at a Glance 2. Safety Precautions 3. Meter Description 4. Specifications 5. Measurement Procedures 6. Automotive Applications 7. Battery Replacement 8. Care & Maintenance 9. Warranty Information 10. Troubleshooting

Features at a Glance

Key components: Digital multimeter with rotary function switch, LCD display, test lead jacks, transistor test socket, and protective holster.

Feature	Description
DC Voltage	0.1mV to 1000V measurement range
AC Voltage	0.1V to 750V measurement range
DC Current	0.1µA to 10A measurement range
AC Current	0.1µA to 10A measurement range
Resistance	0.1Ω to 2000kΩ measurement range
Continuity Test	Audible beeper for circuit continuity
Diode Test	Forward voltage drop measurement
Transistor hFE	NPN and PNP transistor gain test
LCD Display	3½ digit, 2000 count with backlight
Overload Protection	Fused current inputs for safety

Safety Precautions

Read all safety information before use to prevent injury or meter damage.

Do not exceed maximum input limits shown on meter.
Use proper terminals, function, and range for measurements.
Do not use if meter or test leads are damaged.
Disconnect test leads from circuit before changing functions.
Use caution when working with voltages above 60V DC or 30V AC.

WARNING! Risk of electric shock. Do not measure voltage while function switch is set to current or resistance. Replace blown fuses with identical type and rating.

Meter Description

Front panel layout and control functions.

LCD Display: Shows measurement value, function symbols, and battery status.
Rotary Function Switch: Selects measurement function and range.
Input Jacks: COM (common), VΩmA (voltage/resistance/current up to 200mA), 10ADC (current up to 10A).
Transistor Test Socket: For hFE measurement of NPN/PNP transistors.
Power Button: Turns meter ON/OFF; holds backlight button.

CAUTION! Ensure function switch is set to correct position before connecting to circuit.

Specifications

Display: 3½ digit LCD, 2000 counts with backlight.
DC Voltage: 200mV/2V/20V/200V/1000V ranges ±(0.5%+2).
AC Voltage: 200V/750V ranges ±(1.2%+10).
DC Current: 200µA/2mA/20mA/200mA/10A ranges ±(1.0%+2).
AC Current: 200µA/2mA/20mA/200mA/10A ranges ±(1.5%+5).
Resistance: 200Ω/2kΩ/20kΩ/200kΩ/2000kΩ ranges ±(0.8%+3).
Diode Test: Test current 1mA, open circuit voltage 2.8V.
Transistor hFE: Test current 10µA, Vce 2.8V.
Power Supply: 9V battery (included).
Operating Temp: 0°C to 40°C (32°F to 104°F).

Measurement Procedures

Step-by-step instructions for common measurements.

Measuring DC Voltage: Set function switch to DCV range. Connect black lead to COM, red lead to VΩmA. Connect probes to circuit (red to positive, black to negative). Read display.

Measuring Resistance: Set function switch to Ω range. Ensure circuit is de-energized. Connect leads across component. Read display.

Continuity Test: Set function switch to continuity symbol. Connect leads across circuit. Beeper sounds if resistance <50Ω.

Diode Test: Set function switch to diode symbol. Connect red lead to anode, black to cathode. Forward voltage drop (0.5V-0.8V for silicon) displayed.

Transistor hFE: Set function switch to hFE. Insert transistor leads into correct NPN/PNP socket. Read gain value.

Automotive Applications

Common automotive diagnostic tests.

Battery Voltage: Set to DCV 20V, measure across battery terminals (12.6V fully charged).
Alternator Output: Start engine, measure battery voltage at 2000 RPM (13.8V-14.4V normal).
Fuse Testing: Set to continuity, test across fuse (beeper sounds if good).
Sensor Testing: Measure resistance of coolant temp sensor, compare to specifications.
Circuit Testing: Check for voltage drop across connections (should be <0.2V).

Tip: Always disconnect battery ground when working on electrical systems to prevent shorts.

Battery Replacement

Replace battery when low battery symbol appears.

Turn meter OFF and disconnect test leads.
Remove screw from battery compartment cover.
Remove old 9V battery.
Install new 9V battery, observing polarity.
Replace cover and secure screw.

WARNING! Do not operate meter with low battery as readings may be inaccurate. Dispose of old battery properly.

Care & Maintenance

Keep meter clean and dry. Store in protective case when not in use.

CAUTION! Do not expose to extreme temperatures, moisture, or dust. Clean with dry cloth only; no solvents.

Warranty Information

Cen-Tech Automotive Meter 95670 comes with limited 1-year warranty covering defects in materials and workmanship. Warranty does not cover damage from misuse, abuse, or unauthorized repair. For warranty service, contact customer service with proof of purchase. Copyright © 2025 Cen-Tech; trademarks of Harbor Freight Tools. For support, visit www.harborfreight.com or contact 1-800-444-3353.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No display	Dead battery	Replace 9V battery.
Inaccurate readings	Low battery/wrong range	Replace battery; select proper range.
Continuity beeper not working	High resistance/open circuit	Check circuit continuity; resistance must be <50Ω.
Meter shows "1" or "OL"	Overrange	Select higher range; check if circuit is open.
Fuse blown	Overcurrent	Replace with identical 250V/200mA or 250V/10A fuse.

Reset: Turn meter OFF and ON; remove battery for 30 seconds if meter locks up.

Service: 1-800-444-3353; www.harborfreight.com