kit
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kit
A set of related parts, tools, or materials sold in one package in order to assemble, repair, or carry out something.
Zu Weihnachten hat er ein Modellbau-Kit für ein Segelschiff bekommen.
For Christmas, he got a model-building kit for a sailing ship.
The word 'Kit' (kit) is a direct loanword from English and has the same meaning: a set of related parts for a specific purpose.
Dieses Kit enthält alles, was Sie für die Reparatur benötigen.
This kit contains everything you need for the repair.
'Kit' (kit) is very often used as the second part of compound nouns to describe the purpose of the set. Examples are 'Modellbau-Kit' (model-building kit), 'Test-Kit' (test kit), 'Erste-Hilfe-Kit' (first-aid kit), or 'Reparatur-Kit' (repair kit).
Er hat sich ein Erste-Hilfe-Kit für seine Wanderungen gekauft.
He bought himself a first-aid kit for his hikes.
In the general meaning, you often find 'Kit' (kit) in connection with hobbies or DIY. Verbs like 'zusammenbauen' (to assemble) or 'basteln' (to craft/tinker) are typical signal words.
Die Anleitung erklärt, wie man das Modellbau-Kit richtig zusammenbaut.
The instructions explain how to assemble the model-building kit correctly.
The meaning as a set for laboratory tests is limited to scientific or medical terminology. You hear or read it in the context of 'Labor' (laboratory), 'Analyse' (analysis), or 'Diagnostik' (diagnostics).
Für den Corona-Test wird ein spezielles diagnostisches Kit verwendet.
A special diagnostic kit is used for the coronavirus test.
set
'das Set' and 'das Kit' both mean several related parts in one unit. 'Set' is more general and fits many things that are sold or used together. 'Kit' is used more when the parts are needed for a specific task, for example for building, repairing, testing, or experimenting. The words can be confused because a kit is often also a set. When the purpose is important and all the necessary materials are included, 'Kit' sounds more precise.
Im Labor braucht die Ärztin ein Kit für den schnellen Test.
In the lab, the doctor needs a kit for the quick test.
Für die Küche haben wir ein Set mit sechs Gläsern gekauft.
We bought a set of six glasses for the kitchen.