The Proskit MT-3109 is a 3 3/4-digit digital clamp meter with a 3,999-count LCD display. It measures DC voltage, AC voltage, AC current, DC current, resistance, frequency, capacitance, and duty cycle, and includes a continuity test with buzzer. The 30mm maximum jaw opening accommodates most standard wire gauges and small cable bundles.

Features include automatic range selection, REL (relative) measurement mode, sleep mode for battery conservation, overload protection, and automatic shutdown. The instrument ships with a carrying case and test leads.

Key Features

• 3,999-count (3 3/4-digit) LCD display
• Measures DCV, ACV, ACA, DCA, resistance, frequency, capacitance, and duty cycle
• Continuity test with audible buzzer
• Automatic range selection
• REL (relative) measurement mode
• Accuracy ±1.0%
• Sleep mode and overload protection
• Automatic shutdown
• Maximum jaw opening: 30mm
• Low battery indicator

Product Benefits

• AC and DC current measurement without breaking the circuit — clamp over the conductor
• Auto-range selects the correct scale automatically, reducing measurement errors
• REL mode lets you zero-out a baseline reading and display only the change
• Frequency and capacitance ranges extend usefulness beyond basic voltage/current work
• Carrying case and terminals included — ready to use from the box

Technical Specifications

• Model: MT-3109
• Brand: Proskit
• Display: LCD, 3,999 count (3 3/4 digits)
• Maximum jaw opening: 30mm
• AC Voltage: 4/40/400V ±(1.2%+5d); 600V ±(1.5%+5d)
• DC Voltage: 400mV/4V ±(1.0%+3d); 40/400V ±(1.0%+1d); 600V ±(1.0%+5d)
• AC Current: 40A ±(3.0%+8d); 400A ±(3.0%+5d)
• DC Current: 40A ±(2.5%+5d); 400A ±(2.5%+3d)
• Resistance: 400Ω ±(1.2%+5d); 4kΩ/40kΩ/400kΩ ±(1.0%+5d); 4MΩ ±(1.2%+5d); 40MΩ ±(1.5%+5d)
• Frequency: 10/100/1k/10k/100k/1MHz ±(0.1%+5d); 10MHz (reference only)
• Capacitance: 40nF/400nF/4µF/40µF ±(5.0%+10d); 100µF ±(6.0%+10d)
• Power source: AAA 1.5V × 3 (not included)

Why You'll Love It

• Clamp measurement means no circuit interruption — faster and safer than in-line ammeters
• Wide measurement range from millivolts to 600V and up to 400A covers most electrical work
• Frequency and capacitance measurement saves carrying a separate component tester
• Carrying case and terminals arrive in the box so you are ready to measure on day one