Does it measure frequency?

Inexpensive multimeter that measures AC V - DC V - Resistance - Amperage - Checks Diodes... But if you're asking if it is a oscilloscope... No

Can this safely test fuses for continuity?

Of course it can. Set the dial on the meter to the exact opposite of the off position. Then move it one click to the left. When you touch the probes together it should make a sound. Now touch the probes to the opposite ends of the fuse. If it's good you will hear the same sound.

Are the batteries already installed in the device?

batteries included but not installed

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

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Network Cable Tester,Line Finder with Probe Tone,Wire Tracker Multifunction,RJ11 RJ45 Cable Tracer,Telephone Line Test,Ethernet LAN Network Cat5 Cat6 Cable Maintenance Collation-Blue

Network Cable Tester,Line Finder with Probe Tone,Wire Tracker Multifunction,RJ11 RJ45 Cable Tracer,Telephone Line Test,Ethernet LAN Network Cat5 Cat6 Cable Maintenance Collation-Blue

Product ID: 413612361

Details

Brand
Mastfuyi
Color
US -BLUE
Item Weight
200 Grams
Power Source
Battery
Style
Blue

📞Telephone line status & continuity test

📡Multifunction cable tracing

🔍Pin-by-pin line fault detection

Description

🔧 Master your network game with precision and confidence!

TRACE LIKE A PRO - Quickly identify and trace RJ11/RJ45 cables without damaging insulation—stay ahead in network troubleshooting.
COMPACT POWERHOUSE - Lightweight, durable, and portable design fits perfectly in your toolkit for on-the-go network maintenance.
KNOW YOUR LINE STATUS - Test telephone line conditions—idle, ringing, busy—and verify TIP/RING polarity for flawless telecom diagnostics.
VERSATILE CONNECTIVITY - Supports RJ11, RJ45, power lines, speaker wires, and more with included alligator clip adapter—one tool, endless possibilities.
PINPOINT FAULTS INSTANTLY - Detect open circuits, shorts, wiring errors, and reversed polarity with clear LED indicators up to 30m away.

The Mastfuyi Network Cable Tester FY869 is a multifunctional tool designed for professional-grade cable tracing, telephone line testing, and fault detection. Compatible with RJ11 and RJ45 cables, it offers pin-by-pin mapping, continuity checks, and line status diagnostics. Its portable, durable design and versatile adapters make it an essential device for IT pros and network technicians maintaining Cat5/Cat6 Ethernet and telephone lines.

Specifications

ASIN	B09M6YPWTJ
Best Sellers Rank	#31,647 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #53 in Network & Cable Testers
Brand	Mastfuyi
Brand Name	Mastfuyi
Color	US -BLUE
Customer Reviews	4.3 out of 5 stars 982 Reviews
Included Components	Digital Multimeter, Test Leads, AAA Batteries, Carrying Case, User Manual
Item Weight	200 Grams
Manufacturer	Mastfuyi
Measurement Type	Multimeter
Min. Operating Voltage	0.6 Volts
Minimum Operating Voltage	0.6 Volts
Model	FY8233E
Part Number	FY8233E
Power Source	Battery Powered
Specification Met	Ul 61010-1, Iec 61010-2-030
Style	Blue
Style Name	Blue
UPC	728990021767
Upper Temperature Rating	60 Degrees Celsius

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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