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🔌 Power up your precision — never miss a watt!
The Klein Tools ET900 is a professional-grade USB-A digital power meter designed for precise measurement of voltage (3-20V), current (0.05-3A), capacity, energy, and resistance. It supports continuous monitoring for up to 1000 hours, tests standard and Qualcomm Quick Charge USB-A ports, and operates battery-free by drawing power from the tested port. Built rugged and compact, it withstands jobsite demands including 6.6-foot drops, making it an essential tool for tech-savvy professionals who demand reliable, real-time USB power diagnostics.










| ASIN | B07FMHHS43 |
| ASIN | B07FMHHS43 |
| Best Sellers Rank | #20,539 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #45 in Voltage Testers |
| Brand Name | KLEIN TOOLS |
| Color | Orange |
| Customer Reviews | 4.6 4.6 out of 5 stars (337) |
| Customer reviews | 4.6 4.6 out of 5 stars (337) |
| Date First Available | 4 September 2018 |
| Department | Unisex-Adult |
| EU Spare Part Availability Duration | 1 Years |
| Global Trade Identification Number | 00092644691386 |
| Included Components | USB Digital Meter, USB-A (Type A) |
| Is Discontinued By Manufacturer | No |
| Item Dimensions | 21.2 x 3.2 x 1.4 centimeters |
| Item Length | 2.84 Inches |
| Item Type Name | USB Power Meter, USB-A Digital Meter for Voltage, Current, Capacity, Energy Resistance |
| Item Weight | 0.07 Pounds |
| Item Width | 1.25 Inches |
| Item model number | ET900 |
| Manufacturer | KLEIN TOOLS |
| Manufacturer | KLEIN TOOLS |
| Maximum Operating Voltage | 20 Volts |
| Measurement Type | Voltmeter, Ammeter, Ohmmeter |
| Minimum Operating Voltage | 3 Volts (DC) |
| Model | ET900 |
| Part Number | ET900 |
| Power Source | Powered By Usb |
| Product Dimensions | 21.21 x 3.23 x 1.4 cm; 31.75 g |
| Specification Met | Likely Meets Various Industry Standards and Certifications, Including Fcc, Ce, and Ul |
| Style Name | USB-A Meter |
| UPC | 092644691386 |
| Upper Temperature Rating | 85 Degrees Celsius |
M**N
seh informativ
L**S
Bueno y útil, idénticas medidas de voltaje que la Power Z, recomendado.
L**O
La grandezza delle lettere sul display richiede gli occhiali se hai più di 50 anni
M**.
Muy buena herramienta
S**H
Being an old electronics technician (retired) USB ports are a mystery. How much voltage? How much current? This is the good tool and shows all this. Good trouble shooting tool and looks rugged enough to toss into the tool kit. It works well.
Trustpilot
2 months ago
5 days ago