Introduction
The ZOYI ZT‑703S is a versatile pocket-sized tool combining a dual-channel oscilloscope, a true-RMS multimeter, and a function generator into a single compact device. It’s ideal for hobbyists, field technicians, and electronics pros seeking a portable diagnostic powerhouse without breaking the bank.
✅ Key Features
Dual‑Channel 50 MHz Oscilloscope
- Sample rates up to 280 MSa/s (with high-speed mode)
- Two BNC inputs, X–Y mode, FFT, auto-triggering & cursors
True‑RMS Multimeter
- 25,000 counts, autoranging/manual range, ±0.05 % basic accuracy
- Measures AC/DC voltage, current, resistance, capacitance, frequency, diodes, continuity
Function Generator
- Outputs sine, square, triangle, pulse, sawtooth waveforms
- Standard range up to ~5 kHz, advanced mode up to ~344 kHz
Hardware & Battery
- 3.5″ IPS color screen, sturdy ABS/TPE construction
- Powered by a replaceable 18650/3400 mAh Li-ion battery with USB-C charging
Design & Accessories
- Folds-out stand, ceramic fuses, firmware updates, internal storage for screenshots
🔧 Pros & Real-World Feedback
Compact & rugged: Roughly 177×89×40 mm, weighing ~390 g—perfectly pocketable yet sturdy
Accurate readings: Users report multimeter performance meeting or exceeding specifications
Responsive oscilloscope: High-speed mode enables usable display up to ~50 MHz
Signal generator useful, but interface clunky: Good range of waveforms, but menus aren’t very intuitive
From a user on BudgetLightForum:
“The oscilloscope function is excellent… perfect for beginners or as a mobile tool for a quick look at a circuit.”
⚠️ Limitations & What to Watch
- Signal generator UI is awkward, and higher frequency settings are hidden in menus
- FFT feature exists, but lacks labels and controls—of limited use
- Trigger and buffer quirks: some visual artifacts and triggering issues persist in high-speed modes; firmware improvements are pending
- Display prone to scratches—handle with care
🎯 Who Should Buy?
Ideal for anyone who needs quick diagnostics on the go:
- Electronics hobbyists and makers
- Repair technicians and field engineers
- Students and labs needing portable instrumentation
Not ideal if your main need is:
- Professional-grade oscilloscopes
- Heavy-duty waveform analysis or precision signal generation
💵 Pricing & Value
Priced around £95–£110 , the ZT‑703S delivers exceptional value compared to buying individual bench instruments.
- multi-function oscilloscope multimeter
- ZOYI ZT‑703S
- pocket oscilloscope 50 MHz
- handheld DSO multimeter signal generator
- ZT‑703S dual channel scope
🎯 Final Verdict
For its price and portability, the ZT‑703S excels as a mobile 3-in-1 tool—especially for quick diagnostics, field tasks, and learning electronics. While its generator and FFT features are basic, the oscilloscope and multimeter functions exceed expectations. ZOYI continues to refine with firmware updates, making this a smart buy for enthusiasts and tech professionals alike
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