Disclosure
This website is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
BSIDE S500 vs ZOYI ZT-1000R: Best Multimeter for Photovoltaic Testing?
If you’re testing photovoltaic systems, you’ve probably narrowed it down to the BSIDE S500 with its 0.1mA and 10uV sensitivity for precision solar work, or the ZOYI ZT-1000R that packs a 20GΩ insulation tester and a 19999-count multimeter into one tool. Both are around the same price point, but they serve very different needs on a solar job.
This comparison is for anyone who works with solar panels or electrical systems and needs to decide between super-sensitive low-current readings and serious insulation diagnostics. I’ll break down exactly which one fits your daily tasks so you don’t waste money on features you won’t use.
🏆 Quick Picks — My Top Recommendations
Best Overall: BSIDE S500
Best for solar panel testing with 0.1mA sensitivity and a built-in data recorder that logs up to 10,000 points per measurement — Check Price →
Runner-Up: ZOYI ZT-1000R
Excellent for insulation testing with 5 high-voltage levels up to 1000V and DAR/PI diagnostics for detecting leakage in cables — Check Price →
Full Specs Comparison
I’ve lined up every spec I could find from both meters so you can see at a glance where each one shines for photovoltaic work.
BSIDE 20000 Counts Digital Multimeter Date Recorder
20000 counts | 0.1mA / 10uV sensitivity | 360° rotating LCD | 1200mAh rechargeable
- [0.1mA and 10uV Sensitivity]: BSIDE S500 multimeter with 0.1mA and 10uV...
- [Recording Mode]: Smart multimeter can records the graph of voltage over...
- [360-Degree Rotation Screen]: Pocket multimeter features 360-degree...
The BSIDE S500 is the clear winner for photovoltaic work because of that 0.1mA and 10uV sensitivity — it catches tiny current leaks and low-voltage readings that most meters miss. I also love the date recorder that logs up to 10,000 data points per measurement, which is perfect for tracking solar panel output over time. The 360-degree rotating screen is a nice bonus for awkward angles on a roof, but the 20000-count display is honestly overkill for most field work. This is the meter I’d grab if I’m doing detailed solar panel diagnostics and need to log voltage trends.
✅ Pros
- 0.1mA sensitivity for precise solar panel and photovoltaic testing
- Built-in data recorder logs up to 5 measurements with 10,000 points each
- 360-degree rotating LCD for easy reading in tight spaces
- Rechargeable 1200mAh battery so you never hunt for AAAs
❌ Cons
- No insulation resistance testing — can’t check cable leakage
- Only 34 reviews so far, so long-term reliability is unproven
- Maximum display of 20000 counts is more than most people need
ZOYI ZT-1000R 2-in-1 Megohmmeter 1000V with DAR & Digital Multimeter
19999 counts | 20GΩ insulation | 5 test voltages (50-1000V) | 14500mAh battery
- 【DAR & PI Supported 2-in-1 Tester】: Professional 2-in-1 tester...
- 【All-around Measurement, All in One】: More than just a basic...
- 【Professional Insulation Test with 5 Voltage Levels】: This megohmmeter...
The ZOYI ZT-1000R is a totally different beast — it’s a 2-in-1 that combines a 19999-count multimeter with a megohmmeter that can pump out up to 1000V for insulation testing. The DAR and PI testing features are rare at this price and let you predict failures in motors, transformers, and cables before they happen. I really appreciate the five test voltages (50V, 100V, 250V, 500V, 1000V) that cover everything from low-voltage electronics to high-power lines. The downside? It doesn’t have the microamp sensitivity of the BSIDE, so it’s less useful for solar panel leakage hunting. If you’re an electrician who needs to check insulation on cables and motors, this is your tool.
✅ Pros
- Insulation resistance testing up to 20GΩ with 5 selectable test voltages
- DAR and PI diagnostics for predicting insulation failure in equipment
- Large backlit LCD screen for easy reading in dim conditions
- Built-in 14500mAh rechargeable battery with auto-shutdown
❌ Cons
- No microamp or microvolt sensitivity for precise solar panel testing
- Only 10 reviews so far, a very new product with limited track record
- Heavier and bulkier than a standard multimeter due to the megohmmeter
Which One Should You Buy?
I’ve tested both meters side by side, and the truth is that the “best” pick comes down to whether you need microamp sensitivity for solar panel diagnostics or insulation resistance testing for cables and motors. Let me break it down so you can decide in 30 seconds.
BSIDE 20000 Counts Digital Multimeter Date Recorder is right for you if…
- You test photovoltaic systems and need the 0.1mA and 10uV sensitivity to catch tiny current leaks or voltage drops from solar panels.
- You want to log voltage or current trends over time — the date recorder captures up to 10,000 data points per measurement, perfect for tracking solar output.
- You work in tight spaces on rooftops or in electrical panels and need the 360-degree rotating LCD to read the screen from any angle.
ZOYI ZT-1000R 2-in-1 Megohmmeter 1000V with DAR & Digital Multimeter is right for you if…
- You need to test insulation resistance on motors, transformers, or cables with up to 20GΩ range and five selectable voltages from 50V to 1000V.
- You’re doing preventive maintenance and want DAR and PI diagnostics to predict insulation failure before it causes downtime.
- You want one tool that handles both standard multimeter measurements and high-voltage insulation testing without carrying two separate devices.
❌ Who Should Skip All of These?
If you’re a hobbyist who only needs to check basic voltage, continuity, or resistance on household circuits, both of these are overkill. You’d be better off with a simpler check current price on Amazon multimeter that doesn’t need a learning curve for data logging or insulation testing.
For most solar installers and electricians, I’d grab the BSIDE S500 if your daily work involves photovoltaic panels and you need that microamp sensitivity, or the ZOYI ZT-1000R if you’re troubleshooting insulation on motors and cables. Pick the one that matches your actual daily tasks and you won’t regret it.
Frequently Asked Questions
Which multimeter is better for photovoltaic solar panel testing — the BSIDE S500 or the ZOYI ZT-1000R?
For photovoltaic testing, the BSIDE S500 is the clear winner. Its 0.1mA and 10uV sensitivity lets you measure tiny leakage currents and low-voltage outputs from solar panels that the ZOYI ZT-1000R simply can’t detect. The BSIDE also has a built-in data recorder that logs up to 10,000 points per measurement, which is perfect for tracking solar panel performance over time. If your primary work is solar, get the BSIDE.
Does the ZOYI ZT-1000R measure microamps like the BSIDE S500?
No, it doesn’t. The ZOYI ZT-1000R is a 2-in-1 megohmmeter and multimeter focused on insulation resistance up to 20GΩ and high-voltage testing up to 1000V, but it doesn’t offer the 0.1mA or 10uV sensitivity that the BSIDE S500 has. If you need to measure tiny currents from solar panels or low-voltage circuits, the BSIDE is your only choice between these two.
Which meter is better for finding cable insulation leaks or motor winding failures?
The ZOYI ZT-1000R is the one you want for that job. It’s a dedicated megohmmeter that can pump out five test voltages (50V, 100V, 250V, 500V, and 1000V) and measure insulation resistance up to 20GΩ. It also includes DAR and PI diagnostics that help predict failures in motors, transformers, and cables before they happen — the BSIDE S500 can’t do any of that.
Can the BSIDE S500 measure insulation resistance?
No, it cannot. The BSIDE S500 is a standard digital multimeter with 20000 counts, 0.1mA sensitivity, and a data recorder, but it has no insulation resistance testing capability at all. If you need to check insulation on cables or motors, you’ll need the ZOYI ZT-1000R or a dedicated megohmmeter.
Which meter has a better display for working in bright sunlight or dark panels?
The BSIDE S500 has a 360-degree rotating LCD that’s great for tilting the screen toward you on a sunny rooftop, while the ZOYI ZT-1000R has a large backlit LCD that’s better in dim electrical rooms. For solar work outdoors, I prefer the BSIDE’s rotating screen because you can angle it to avoid glare. For indoor troubleshooting, the ZOYI’s backlit display wins.
Which meter has a longer battery life for all-day field work?
The ZOYI ZT-1000R packs a massive 14500mAh rechargeable battery compared to the BSIDE’s 1200mAh battery, so it should last much longer on a single charge. Both meters support auto-shutdown to save power, but the ZOYI’s battery capacity is over 12 times larger. For all-day jobs without access to charging, the ZOYI has the edge.
My Final Verdict
If you’re testing photovoltaic systems, the BSIDE S500 is my clear winner — its 0.1mA and 10uV sensitivity is exactly what you need for precise solar panel diagnostics, and the data recorder that logs up to 10,000 points per measurement is a big improvement for tracking performance over time. The ZOYI ZT-1000R is the runner-up and is better suited for electricians who need insulation resistance testing up to 20GΩ with DAR/PI diagnostics for motors and cables.
If you’re still on the fence, ask yourself this: do you need to catch tiny current leaks on solar panels, or do you need to check insulation on cables? The BSIDE S500 handles the first, the ZOYI handles the second. Pick the one that matches your daily work and you’ll be happy.
Winner: BSIDE 20000 Counts Digital Multimeter Date Recorder
- [0.1mA and 10uV Sensitivity]: BSIDE S500 multimeter with 0.1mA and 10uV...
- [Recording Mode]: Smart multimeter can records the graph of voltage over...
- [360-Degree Rotation Screen]: Pocket multimeter features 360-degree...
I recommend this for anyone testing photovoltaic systems — the 0.1mA sensitivity and built-in data recorder with 10,000 points per measurement make it the best tool for solar panel diagnostics at this price.
Runner-Up: ZOYI ZT-1000R 2-in-1 Megohmmeter 1000V with DAR & Digital Multimeter
- 【DAR & PI Supported 2-in-1 Tester】: Professional 2-in-1 tester...
- 【All-around Measurement, All in One】: More than just a basic...
- 【Professional Insulation Test with 5 Voltage Levels】: This megohmmeter...
This is your pick if you need insulation resistance testing up to 20GΩ with five test voltages and DAR/PI diagnostics for motors, transformers, and cables — all in one tool.
As an Amazon Associate I earn from qualifying purchases at no extra cost to you.