One for the auto technician’s toolbox, the INNOVA 3340 multimeter is good for testing everything from volts, amps and resistance to alternator diodes, RPM, dwell angle and temperature. It was specifically designed to diagnose engine issues and although not intended as a replacement for dedicated, professional garage instruments, it is great as an everyday tool and for the average joe or hobbyist.
- Tests alternator diodes, solenoids
- Measures vehicle RPM / inductive RPM pickup
- Measures DC current to 15 amps
- Measures temperature
- MIN/MAX recording
- Auto ranging
- Auto shut-off
- Auto zero adjustment
- Category II rated
- Size: 6.8” (173mm), 3.6” (90mm), 1.7” (43mm)
- Weight (oz/grams): 9oz (255g)
- Temperature probe
- RPM clamp
- Carrying case
- Two AA batteries
- Instructions (innova 3340 manual)
In-depth Review of the INNOVA 3340
This is a decent multimeter for the electrician and engine tech, with years of proven usage in the field. Though tailored to the automotive market, it also does standard electrical measurements well, with input ranges to include AC and DC voltage, AC and DC milliamps, DC amps, resistance, continuity, frequency and more.
Vehicle engine tests feature an alternator output, RPM checks for conventional and non-distributor ignition systems, and tacho check. The included clamp is a nice touch for checking ignition cables (hands-free) and is useful for older vehicles. You can also check battery voltage with the INNOVA 3340, as well as probe temperatures to read Fahrenheit and Celsius.
This is an auto ranging multimeter, so you can simply select a given input with the dial and the meter will do the rest. Auto ranging is generally slower to display than an equivalent manual ranging version as it needs extra time to work out the right range. The 3340 is fairly timely, however.
NOTE: there may be fluctuations when it is sat idle due to the auto range. While this is quite normal due to ambient conditions, it will not affect any readings when put to work.
AC / DC voltage: to 600V
AC / DC current (milliamps): to 400mA
DC current (amps): 15A – temporarily
Resistance: to 40MΩ
Diode check: 2V
Frequency: 10Hz to 2MHz
Temp: -58°F (-50°C) to 752°F (400°C) – type K thermocouple
Input impedance: 10MΩ
|Pulse width (MS)||Time solenoid / actuator energized||1 to 999 milliseconds|
|Duty cycle (DUTY%)||Percentage solenoid / actuator energized||0.1 to 99.9%|
|Clamp current (A)||Measures AC / DC current||Amps|
|DIS||Measures distributor-less ignition systems||0 to 10,000rpm|
|CON||Measures conventional ignition system||0 to 10,000rpm|
|COP||Measures coil-on-plug ignition system||0 to 10,000rpm|
|Tachometer RPM||Measures engine speed||0 to 10,000rpm|
|Dwell angle||Measures breaker points dwell angle||°|
There are four buttons for extra functions and to flit between ranges on a given input.
Change between resistance, continuity, diode check and AC and DC milliamp ranges, as well as clamp current.
For selecting the number of cylinders when set to dwell angle or RPM (tachometer).
Locks the current reading on screen.
Records a higher reading and lower reading for when the result is changing.
AUTO POWER OFF: the INNOVA 3340 has a useful auto off feature and will turn itself off after 10 minutes of sitting idle. This is useful for both extending battery life and the life of the meter.
While not as accurate as a dedicated voltmeter – where DC voltage tends towards <±0.1% – it has many functions for the price and a decent level of accuracy for general purpose electrics.
|DC volts||400mV / 600V||±(0.8%+5)||10mV @ 40V|
|AC volts||400mV / 600V||±(1.2%+8) @ 400-600V||1V @ 400-600V|
|DC milliamps||40mA / 400mA||±(1.5%+5)||100µA @ 400mA|
|AC milliamps||40mA / 400mA||±(2.0%+5)||10µA @ 40mA|
|Resistance||400Ω / 40MΩ||±(1.0%+5) @400-400kΩ||1Ω @ 4kΩ|
|Frequency||10Hz / 2MHz||±(0.1%+5)||0.001Hz|
|Dwell angle||1 to 12 cylinders||±(2.0%+5)|
|RPM||0 to 10,000rpm||±(2.0%+5)||1RPM|
|Pulse width||1 to 999ms||±(2.0%+5)|
|Duty cycle||0.1 to 99.9%||±(2.0%+5)|
|Temperature °F||-58 to 752°F||±(1.5%/±5°F) @ -58-392°F|
|Temperature °C||-50 to 400°C||±(2%/±3°C) @ 200-400°C|
Design / Build Quality
The INNOVA 3340 multimeter is strong and contoured and has a protective rubber boot. It feels sturdy to the touch and should stand up to the rigors of most garage setups. The nifty little probe lead holders on the side of the unit may give up after a while, but it also comes with a handy carry case. Most importantly, the batteries are accessed by a separate panel.
The dial has 16 input selector stations, not including two off positions. Mounted proud, it is ergonomically designed and easy to operate. The buttons on the 3340 provide extra functionality with some of the inputs, such as continuity and resistance, and AC / DC milliamps.
This meter has received the seal of approval on safety and quality from Underwriters Laboratories. This label is commonly seen on electrical tools and systems throughout the US and is a further mark of quality and peace of mind.
Display and Interface
The LCD display is a standard 3 3/4 digit (max 3999 displayed). It is clear and concise and shows all the symbols, such as low battery, AC/DC volts, current, ohms, degrees, dwell angle, temperature units, etc. When a reading goes over range, it will display ‘OL’, aside from DC amps.
Although the dial may seem quite complicated at first for non-electricians, it is clearly labeled and color coded. Furthermore, only resistance and milliamps have more than one function on their input position.
There are four jack sockets including the standard main and common terminals. Amp and milliamp inputs also have their own sockets.
MS, RPM, mA (auto diagnostics / milliamps)
15A (DC amps)
COM (common )
V/Ω/Cont/Diode/Hz (main terminal)
Temperature: the Type-K thermocouple probe plugs directly into the Auto diagnostics / DC amps jack sockets.
This strong meter is further protected by rubber corner guards to provide better impact resistance when dropped. It has 10MΩ input impedance, which helps protect electronics and engine control units under test. The milliamp input circuit is protected by a 500mA fuse, though the DC current input is un-fused. While you can test to 15A, the meter must be allowed to rest for 15 minutes or more for each 15-second test duration.
Best suited to: the 3340 was specifically built to aid automotive industry technicians, being able to test RPM speed, engine solenoids, alternators, and so on. Those with no experience can get good use out of this too, with basic measuring inputs, including volts, amps, resistance and continuity. It may not be suited to those in electronics as there is no capacitance input function.
INNOVA 3340 Pros and Cons
- Great set of auto / car test features
- Nice, clear display
- Auto ranging
- Fairly accurate across most functions
- Hands-free testing
- Measures temperature
- Data hold
- Decent price
NOT SO GOOD
- Screen not backlit
- Stock probe leads could be better
- Side probe holders prone to wear
The perfect backup multimeter in a garage, or even as a main meter for amateurs and professionals alike, the INNOVA 3340 makes light of numerous tasks. It is great for troubleshooting engine issues, such as dwell angle and dodgy alternator diodes, as well as for diagnosing mains electrical faults and basic electronic component failure. It can do what a Fluke does at a fraction of the cost and offers great bang for your buck, though is not meant to replace professional auto test equipment.
You might want to consider replacement probe leads and perhaps the deluxe accessory kit, which can be purchased separately. For a more general purpose multimeter, INNOVA’s 3320 is a good alternative.