Numerics lets you selectively add widgets to Numerics for Apple Watch. Download the Numerics app for Apple Watch from the companion Watch app. On downloading, tap the Numerics app and enable the ‘Show app for Apple Watch’ switch to make it available on your watch.
The Numerics dashboard app for WatchOS is designed for quick micro interactions. To see more information from a widget like previous values on a graph, simply transfer the widget from Apple Watch to iPhone using Handoff.
You can start with looking at a number on Apple Watch, then continue on your iPhone with a swipe from the lock screen to zoom into the data.