Receptacle Wiring Testers: 3 Picks Compared
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A receptacle wiring tester is a plug-in tool that reads the wiring of a standard US outlet and lights a pattern for the fault it finds. An “open hot” fault is one of the conditions these testers are designed to flag, along with open neutral, open ground and reversed wires. The keyword is a term rather than a product title, so this guide uses the product type instead. It compares three plug-in receptacle testers from the product files, each of which names wiring faults in its listing. All figures come from the listing text, with the check date of 18 October 2026.
Quick answer
Two of the three listings name open hot among the faults they detect: the Goldeep ST20 and the TRAKLUME GFCI tester. The XINHUSU kit names open ground and reversed hot and neutral, but not open hot. For a GFCI check with a color LCD, the TRAKLUME and Goldeep listings both describe a screen, while the XINHUSU kit is a lights-only tester sold with a grounding adapter. Check the listed minimum voltage before you plug in, because the three listings start at 110 V or 120 V.
The three picks at a glance
| Tester (ASIN) | Open hot named in the listing | Listed minimum voltage | Display or indicator |
|---|---|---|---|
| Goldeep GFCI Outlet Tester ST20 (B0H1PVNPMY) | Yes | 120 V | Color LCD and bottom indicators |
| TRAKLUME GFCI Outlet Tester (B0FC2Q84BY) | Yes | 110 V | 1.7 inch color LCD and LED indicators |
| XINHUSU Outlet Tester and Grounding Adapter Kit (B0FN3SM76P) | No; open ground and hot/neutral reverse named | 120 V | Indicator lights |
How these three were chosen
We kept listings that name a plug-in receptacle or GFCI tester and whose text lists at least one wiring fault. The research set for this keyword held 12 listings, and none of them is a plug-in receptacle tester, so the three picks come from the extra product files. The product files added four extra listings for this keyword, and one of them, a GFCI receptacle kit, is a receptacle itself rather than a tester, so it was left out. The three picks are the remaining listings that name wiring faults. Because the keyword asks about open hot, the table records whether each listing names it.
1. Goldeep GFCI Outlet Tester ST20
The listing describes a tester for North American three-wire 120 V outlets. Its bullets list open hot, open neutral, open ground, hot and ground reversed, and other wiring faults. It has a color LCD and bottom indicators, green for a correct outlet and red for a fault. The specification field gives a minimum operating voltage of 120 V and an operating temperature of 32 °F to 122 °F. The auto-hold function locks the reading when the tester is removed. The GFCI function, according to the bullets, needs correct wiring and a breaker in place. A short press of the TEST key generates a leakage current of 6 mA to 9 mA on the ground wire, and the tester shuts off after about 3 minutes of non-use.
Check the Goldeep ST20 on Amazon
2. TRAKLUME GFCI Outlet Tester
The listing describes a GFCI outlet tester with a 1.7 inch backlit color LCD and LED indicators. The bullets say it measures voltage in standard outlets and detects six common wiring faults, and the listed examples include open hot, open neutral, open ground, dual open ground and neutral, and hot and ground reversed. The specification field gives a minimum operating voltage of 110 V and a CAT II 135 V rating. It is listed for standard three-wire outlets, power strips and GFCI outlets. The operating conditions are 32 °F to 122 °F (0 °C to 50 °C) and humidity from 0% to 70% RH. The auto-hold function locks the reading after the tester is removed, and the listing names the brand as TRAKLUME.
Check the TRAKLUME GFCI outlet tester on Amazon
3. XINHUSU Outlet Tester and Grounding Adapter Kit
The listing describes a grounding accessories kit with two parts: an outlet tester and a grounding plug adapter that splits one socket for two mats, sheets or wristbands. The bullets say the outlet tester confirms wiring and proper grounding through indicator lights, and that it detects open ground and hot and neutral reversal. The listing does not name open hot. The specification field gives a minimum operating voltage of 120 V AC, and the compatible-devices field names standard US three-prong outlets and grounding mats. The kit contains two units, and both are described as ABS housings with compact, lightweight designs. The listing describes the kit as suitable for hotels and rentals.
Check the XINHUSU outlet tester kit on Amazon
Worked example: a 115 V receptacle and a 75% humidity room
Take a receptacle that reads 115 V. The TRAKLUME listing gives a minimum of 110 V, so 115 V is inside its listed input. The Goldeep and XINHUSU listings give a minimum of 120 V, so 115 V sits 5 V below both. The gap between the TRAKLUME floor of 110 V and the 120 V floor on the other two is 10 V. The listings do not say what those two testers show below their minimum, so a result from them at 115 V cannot be relied on.
Now take a room at 75% relative humidity. The TRAKLUME listing gives a humidity range of 0% to 70% RH, so 75% is 5 percentage points above its listed limit. The Goldeep and XINHUSU listings give no humidity figure. Check the humidity against the TRAKLUME range before you use it in a damp room or a basement.
What the listings do not say
None of the three listings gives an accuracy figure for its fault detection, and none gives an IP rating. Only the Goldeep and TRAKLUME listings name open hot, and the XINHUSU listing does not. The TRAKLUME listing says it detects six common faults but names only the ones shown above, so the full list is not in the text. The Goldeep listing gives its LED pattern meanings in the bullets only in general terms. The XINHUSU kit is marketed for grounding products as well as outlets, and the listing does not say how the adapter affects the outlet check.
Frequently asked questions
Which of these testers names open hot?
The Goldeep ST20 and the TRAKLUME GFCI tester both name open hot in their listings. The XINHUSU kit names open ground and hot and neutral reversal, but not open hot.
Does a receptacle tester show voltage?
The TRAKLUME listing says it measures voltage in standard outlets and shows readings on its color LCD. The Goldeep ST20 has a color LCD that shows the outlet’s wiring status, and the XINHUSU kit uses indicator lights only.
Can these testers check a GFCI outlet?
The Goldeep ST20 describes a GFCI function that uses the TEST key and a leakage current of 6 mA to 9 mA. The TRAKLUME listing says it works with GFCI outlets. The XINHUSU listing does not describe a GFCI test.
What is the lowest voltage each tester accepts?
The TRAKLUME listing gives 110 V as its minimum operating voltage. The Goldeep and XINHUSU listings give 120 V. None of the three listings gives a maximum voltage for the outlet check.
Conclusion
For a wiring check that names open hot and includes a voltage reading, the TRAKLUME GFCI tester has the widest stated input, from 110 V, and the clearest humidity range. The Goldeep ST20 names the same open hot fault and adds a GFCI test with a stated leakage current, but its minimum is 120 V. The XINHUSU kit is the choice if you need a grounding adapter as well, but its listing does not name open hot. Confirm the minimum voltage and the fault list on the live listing before you buy.
For related reading, see GFCI open ground, best open ground on outlet tester, best receptacle tester and best wall socket tester.
