The Klein Tools ET250 is a digital AC/DC voltage and continuity tester measuring 2 to 600V across AC and DC circuits with a backlit LCD display. It also tests GFCI protected circuits to verify device operation. Built-in test lead holders on the rear are sized for tamper-resistant US outlets. Rated CAT IV 600V with IP53 protection (except lead jacks), accuracy of +/-(2%+2V), and 9.8-foot drop resistance. Uses standard replaceable multimeter test leads. Compatible with 45 to 400 Hz AC frequencies. Backed by Klein Tools' 1-year limited warranty.
How does the ET250 differ from the ET60?
ET250 adds an LCD screen with numeric voltage readout, continuity testing with audible beep, and GFCI outlet testing. ET60 is simpler and fully self-powered — no batteries needed. ET250 requires 3 AAA batteries but gives you a measurable voltage figure and additional test functions.
Can the ET250 test GFCI outlets?
Yes — the ET250 includes a GFCI test mode that simulates a fault to trip the GFCI and confirm protection is active. It's one of the lower-cost options for verifying GFCI function without a dedicated outlet tester.
What does continuity testing mean in practice?
Connect the probes across both ends of a wire, fuse, or connection. The ET250 beeps when current can flow without interruption, confirming the path is complete. A silent result means there's a break somewhere in the circuit.
Does it measure DC voltage?
Yes — 2–600V DC, covering batteries, vehicle circuits, solar panel output, and low-voltage DC control systems, in addition to the 2–600V AC range.
What accuracy does the ET250 provide?
±(2% + 2V) — sufficient for confirming that voltage is present and within expected range. This is a field verification tool, not a calibration-grade instrument.
What frequency range does it support?
45–400 Hz — covering standard 50 and 60 Hz utility power as well as some variable-frequency drive outputs. For high-frequency or power quality applications, a full multimeter is more appropriate.
# Klein Tools® ET250 AC/DC Voltage/Continuity Tester **Model:** `ET250` **Brand:** Klein Tools **Category:** Voltage Tester > The Klein Tools ET250 is a digital AC/DC voltage and continuity tester measuring 2 to 600V across AC and DC circuits with a backlit LCD display. It also tests GFCI protected circuits to verify device operation. Built-in test lead holders on the rear are sized for tamper-resistant US outlets. Rated CAT IV 600V with IP53 protection (except lead jacks), accuracy of +/-(2%+2V), and 9.8-foot drop resistance. Uses standard replaceable multimeter test leads. Compatible with 45 to 400 Hz AC frequencies. Backed by Klein Tools' 1-year limited warranty. ## Specifications | Attribute | Value | |---|---| | Product Type | AC/DC Voltage and Continuity Tester | | Voltage Range Ac | 2–600V AC | | Voltage Range Dc | 2–600V DC | | Safety Rating | CAT IV 600V | | Ip Rating | IP53 | | Frequency | 45–400 Hz | | Accuracy | +/- (2% + 2V) | | Tests Continuity | Yes | | Tests Gfci | Yes | | Display Type | LCD | | Battery Type | 3 × AAA | | Battery Required | Yes | | Drop Protection Ft | 9.8 | | Pollution Degree | 2 | | Overall Length In | 6.06 | | Assembled Weight Oz | 6 | | Barcode (UPC) | 092644690372 | | Warranty | 1-year limited | ## What's Included - Tester - Test leads - 3 × AAA batteries Source: https://www.jaspecs.com/klein-tools/voltage-tester/et250-klein-tools-acdc-voltagecontinuity-tester/