







🔌 Master your network like a pro — never miss a fault or a beat!
The AT278 Network Cable Tester is a multi-functional, professional-grade tool designed for precise cable fault detection using TDR technology, POE voltage identification, and comprehensive network performance testing via PING. Featuring a bright 320x240 color LCD, AC noise filtering, rechargeable lithium battery, and data export capabilities, it’s engineered for efficient, on-the-go diagnostics across RJ45, RJ11, BNC, and metal cables.








| ASIN | B07WRV3N5F |
| Batteries | 1 Lithium Ion batteries required. (included) |
| Batteries Required? | Yes |
| Batteries included? | Yes |
| Battery Cell Type | Lithium Ion |
| Best Sellers Rank | 884,610 in DIY & Tools ( See Top 100 in DIY & Tools ) 696 in Network Testers |
| Colour | AT278 |
| Customer Reviews | 3.8 3.8 out of 5 stars (91) |
| Date First Available | 21 Aug. 2019 |
| Item Weight | 771 g |
| Item model number | AT278 |
| Manufacturer | KOLSOL |
| Material | plastic |
| Package Dimensions | 27.5 x 20.3 x 9.2 cm; 771.11 g |
| Part number | WIWUAT278-K |
| Power source type | Battery Powered |
| Size | AT278 LCD Network Cable Tester |
| Special Features | Big LCD color screen 320*240 and lighting lamp in darkness., Function of storage and memory, Low voltge alarm function and automatic delay power on-off, Rechargeable Lithium battery for more efficient work, Two tone tracing modes: common switch & PoE Switch. |
| Specification met | reachability |
| Style | Modern |
P**L
For the price, excellent
Purchased as replacement item. Had one before but dropped it. It did not survive
R**H
It's okay,
Instructions need to be on a bigger piece of paper, why so small ? Otherwise not bad for apprentices who are learning for first time. Also a belt clip on all units would be better for accessibility when moving about on construction sites. Send me royalty for idea when you sell thousands as not many manufacturers have them.
E**.
per quello che costa è davvero tanta roba. Vediamo solo quanto dura.....
M**N
The plastic body is cheap plastic that could break, but the feature set is huge. I could not find another product with all these features for less than double the price ($300). Update 2021 May: Been using this for a year. Still works as designed.
G**.
Der Tester ist sehr gut. Plus: + Fehler lassen sich schnell aufspüren. Hatte einen Kabel-Fehler. Der Fluke-MicroMapper zeigte gar nichts an. Der AT278 zeigte an, was (Kurzschluss zweier Drähte und Unterbrechung eines Drahtes) und wo (Leitungslänge). + Anleitung auf Deutsch. + Aufbewahrungsbox + Preis/Leistungsverhältnis ungeschlagen Minus: - Der Ladeanschluss ist leider kein USB-C. Ein Schönheitsfehler. Fazit: Würde ich immer wieder kaufen.
J**7
Je l'ai essayé à mon domicile puis à mon travail car nous avions des problèmes réseau ça fonctionne très bien
N**T
Das Gerät ansich ist gut und erfüllt alles, was es verspricht. Nur: Man muss erst herausfinden, wie diess zu verwenden ist, denn die Anleitung ist eher verwirrend. Durch Try and Error haben wir es dann doch geschafft, alle Funktionen zu testen. Technisch ansich 5 Sterne, aber für die mieserable Anleitung muss ich einen Stern abziehen
Trustpilot
5 days ago
3 days ago