Can this be used to test output on microwave Transformers?

Yes. I have used it to check the HV output of a microwave and neon transformers. Be careful. Use one hand to measure and the other hand in your pocket.

Can this be used with oscilloscope to measure ac beside 60hz sinusoidal? what is bandwidth?

I suppose it could, though the signal could potentially be noisy. The leads are not shielded. You would also have to correct the impedance. This probe uses a simple voltage-divider resistor network to do its magic. Good luck!

Could this be use to probe the residual high voltage in a CRT monitor (and to dissipate it)?

Yes, definitely. The probe's input resistance in 1G-ohm (1000 M-ohm). With a typical 500pF filter capacitance in the CRT HV power supply, the discharge rate will be 0.5 seconds to discharge to 37% of the original voltage, 1 second to 37% of that, etc. After 5 seconds there will be only a couple of volts remaining. BE SURE to attach the ground clip to the metal chassis of the CRT device whether or not the probe is connected to a meter. To be completely safe, wait a minute after discharging then repeat the process. The glass in the CRT "absorbs" some charge and can recharge the filter capacitor to a few hundred volts.

can it measure 12 volt vehicle ignition coils?

I could not say for sure. But the probe does indeed measure DC voltage up to 40,000 volts. So you should be able to set your meter that you have the probe plugged into and make the measurement, by setting your meter to read DC volts. (not AC volts) Obviously you're only dealing with 12v on automotive voltage.

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EX ELECTRONIX Express High Voltage Probe 40,000 Volts Max DC, 28,000 Volts Max AC (50/60 Hz)

Product ID: 170464798

Details

Age Range (Description)
Adult
Brand
EX ELECTRONIX
Color
Red Black
Display Type
Digital
Included Components
High Voltage
Outer Material
Plastic

⚡40,000V max DC power

🎯±1% accuracy up to 20kV DC

🔋1,000MΩ ultra-high input impedance

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Description

⚡ Power Up Your Precision — Measure Like a Pro!

PRECISION YOU CAN TRUST - Experience industry-leading accuracy of ±1% up to 20kV DC, ensuring reliable diagnostics every time.
COMPACT DURABLE DESIGN - Lightweight 13.4-inch probe built for professional use, combining portability with rugged reliability.
ULTRA HIGH INPUT IMPEDANCE - 1,000MΩ input impedance minimizes circuit loading for pristine signal integrity.
UNMATCHED VOLTAGE HANDLING - Safely measure up to 40,000 volts DC and 28,000 volts AC with confidence.
ROBUST 1000 1 DIVISION RATIO - Easily scale down high voltages for safe, precise multimeter readings without compromise.

The EX ELECTRONIX Express High Voltage Probe delivers professional-grade voltage measurement with a max capacity of 40,000V DC and 28,000V AC. Featuring a 1,000MΩ input impedance and ±1% accuracy up to 20kV DC, it ensures precise, safe readings. Its 1000:1 division ratio and durable design make it an essential tool for engineers and technicians demanding reliable high-voltage diagnostics.

Specifications

ASIN	B00LW5UKQ6
Additional Features	High Accuracy
Age Range Description	Adult
Best Sellers Rank	#156,055 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #643 in Test Probes & Leads
Brand Name	EX ELECTRONIX EXPRESS
Color	Red, Black
Customer Reviews	4.5 4.5 out of 5 stars (66)
Display Type	Digital
Included Components	High Voltage Probe, User Manual
Indoor Outdoor Usage	Indoor
Item Length	13.39 Inches
Manufacturer	RSR ELECTRONICS
Model	HVP40
Model Name	HVP40
Outer Material	Plastic
Part Number	HVP40
Power Source	Corded Electric
Product Care Instructions	Wipe Clean
Reusability	Reusable
Style Name	40,000 Volts Max DC, 28,000 Volts Max AC
UPC	714833891352
Unit Count	1.0 Count
Upper Temperature Range	50 Degrees Celsius

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