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Testo
Extech CT70 GFCI and AC Circuit Analyzer
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CT70: 12/15/20 A load; V-drop; GFCI/EPD; CAT II 300 V. RFQ qty.
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Key parameters
Measuring range
−50 to +150 °C (−58 to +302 °F)
Accuracy
±0.2 °C (−25 to +74.9 °C); ±0.4 °C remaining range; ±0.5% of m.v. (+100 to +150 °C)
Sensor type
NTC (thermistor) waterproof immersion/penetration probe
Part Number
0613 1212
Response Time
t99 ≈ 10 s
Cable
Fixed cable 1.2 m (3.937 ft)
Fits outlet and branch-circuit load checks where you need an Extech CT70—selectable 12/15/20 A loads, voltage drop and impedance, plus GFCI/EPD trip tests and wiring fault indication on a color pass/fail display.
Key advantages
- Loads — Selectable 12 / 15 / 20 A
- Line — 90–240 V AC; 45–65 Hz; peak to 350 V
- Drop — Voltage drop 0.1–99.9%; line impedance
- GFCI — Trip time/current; EPD test path
- Safety — CAT II 300 V class; North American 3-prong cord
Typical applications
- Outlet load-handling checks.
- GFCI verification.
- Wiring polarity / impedance surveys.
Selection guide
- Spare CT70-AC cord
- Target load ampacity
- GFCI vs EPD path
Common mistakes
- Using on UPS / dimmer / square-wave outputs.
- Repeating load tests without cool-down.
- Expecting non-NA plug without adapter plan.
When to RFQ / what to tell us
- Quantity, spare cord.
- Ship-to.
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Specs
| Spec | Value |
|---|---|
| SKU | 35928 |
| Brand | Extech |
| Model | CT70 |
| Product type | AC Circuit Analyzer |
| Type | GFCI / AC circuit load analyzer (Extech CT70) |
| AC voltage | 90.0–240.0 V (line); peak to 350.0 V |
| Frequency | 45.0–65.0 Hz |
| Voltage drop | 0.1–99.9% |
| Loads | Selectable 12 / 15 / 20 A load tests |
| Outlet tests | Hot/neutral/ground impedance; N–G voltage; open/reversed wiring; GFCI trip time/current; EPD |
| Safety | CAT II 300 V class |
Documents
FAQ
Q: Load currents? A: Selectable 12, 15, and 20 A.
Q: GFCI test? A: Yes — GFCI trip time/current; EPD path available.
Q: What should I send for a quote? A: Quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Measuring range | −50 to +150 °C (−58 to +302 °F) |
| Accuracy | ±0.2 °C (−25 to +74.9 °C); ±0.4 °C remaining range; ±0.5% of m.v. (+100 to +150 °C) |
| Sensor type | NTC (thermistor) waterproof immersion/penetration probe |
| Part Number | 0613 1212 |
| Response Time | t99 ≈ 10 s |
| Cable | Fixed cable 1.2 m (3.937 ft) |
| Shaft Dimensions | Length 115 mm; Ø5 mm shaft; tip 50 mm × Ø4 mm |
| Protection | IP54; waterproof probe construction |
| Weight | 145 g (5.12 oz) |
| Housing Colors | Plastic housing; grey / black / silver |
| Typical Hosts | testo 112 / testo 110 and other NTC-compatible instruments |
| Document | testo.com 0613 1212 product page + testo 112 data sheet probe table |