What functions does the Amprobe DM78C measure?

AC/DC voltage, resistance, diode test and continuity with beeper. It does not measure current.

Is the DM78C auto-ranging?

Yes. It’s autoranging and also lets you lock a manual range when needed.

What is the display resolution?

Approximately 3200 counts (3¾-digit) with an analog bargraph for changing signals.

What’s included in the box?

DM78C meter, attached test leads, protective pocket carrying case, battery (installed) and user manual.

What are the size and power details?

About 130 × 77 × 18 mm and ~110 g with case; powered by two LR44 button cells with roughly 70 hours of continuous operation.

Amprobe DM78C Credit-Card Multimeter - 600 V, 34 MΩ, 3200-count, Auto/Manual Range

Brand: Amprobe

SKU: 94036

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Datasheet PDF

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Description

Amprobe DM78C Credit Card Size Multimeter

The Amprobe DM78C is a compact, credit-card-sized multimeter designed for portability and convenience, making it an ideal choice for both professional electricians and DIY enthusiasts. Despite its small size, the DM78C offers a wide range of essential functions, making it a versatile tool for basic electrical troubleshooting in a variety of settings. Its lightweight and slim design allow it to fit easily into pockets or tool bags, offering users the ability to perform quick electrical tests on the go.

The DM78C can measure both AC and DC voltages up to 600 V, providing versatility for a variety of electrical applications, from checking outlets and power supplies to troubleshooting wiring and appliances.

Amprobe DM78C Key Features

Amprobe DM78C slips in a shirt pocket yet keeps essential ranges for panels, outlets, appliances and low-voltage controls—ideal as a quick verifier or a lightweight backup to a full-size DMM.

Smallest, go anywhere meter
5 functions/16 ranges
Auto-off saves batteries
Data hold
Protective case included
3200-count display with analog bargraph

specifications

Parameter	Details
DC Voltage	340 mV, 3.4, 34, 340, 600 V; 3.4 V range ±1.0% rdg + 2 dgts; Other ranges ±2.0% rdg + 2 dgts
DC Voltage Resolution	100 µV in 340 mV range
DC Voltage Input Impedance	340 mV range: >100 MΩ; 3.4 V range: 10 MΩ; All other ranges: 9.1 MΩ
AC Voltage (50-60 Hz)	3.4, 34, 340, 600 V ±4.0% rdg + 5 dgts
AC Voltage Resolution	1 mV in 3.4 V range
AC Voltage Input Impedance	3.4 V range: 10 MΩ; All other ranges: 9.1 MΩ
Resistance	340 Ω, 3.4, 34, 340 kΩ, 3.4, 34 MΩ
Resistance Accuracy	340 Ω, 3.4, 34, 340 kΩ ±2.0% rdg + 4 dgts; 3.4 MΩ ±3.0% rdg + 4 dgts; 34 MΩ ±5.0% rdg + 5 dgts
Diode Test	3.4 V ±3.0% rdg + 3 dgts
Continuity Check	Beeper alert at <35 Ω
Display	3¾ digits LCD, max reading 3400
Range Selection	Autoranging and manual range lock
Overrange Indication	“OL” displayed
Polarity Indication	“-” displayed, “+” implied
Battery Warning	Battery symbol displayed when <1.25 V ±0.1 V
Sampling Rate	2/sec display, 20/sec bargraph
Operating Temperature	0°C to 40°C (32°F to 104°F), <70% RH non-condensing
Storage Temperature	-20°C to 60°C (-4°F to 140°F), <80% RH non-condensing
Battery Type	Two 1.5 V (L1154F or LR-44)
Battery Life	70 hours continuous operation
Auto Power-Off	After 10 minutes of non-use
Dimensions	130 x 77 x 18 mm (5.1″ x 3.1″ x 0.6″)
Weight	110 g (3.9 oz) including case

Datasheet

Description specifications Datasheet

Amprobe DM78C Credit-Card Multimeter - 600 V, 34 MΩ, 3200-count, Auto/Manual Range attributes

501 – 750V DC

Max Voltage DC

501 – 750V AC

Max Voltage AC

Yes

Auto Range

True RMS

False

Max Current DC