docs: slight tweaks for accuracy and cross-reference

Author: GregRR

README.md

@@ -14,7 +14,8 @@ characteristics.
 
 Beyond basic conversion, the library supports configurable Callendar–Van Dusen
 models for traceable coefficient sets; generic polynomial, piecewise-polynomial, and
-table-backed custom characteristics; dependency-free IEC R0, custom CVD, and polynomial calibration fitting with auditable parameter covariance
+table-backed custom characteristics; dependency-free IEC R0, custom CVD, and polynomial
+calibration fitting with auditable parameter covariance
 and batch conversion; versioned portable model definitions; IEC 60751 platinum
 tolerance calculations; measurement uncertainty; simulation; built-in model
 discovery; hardware-neutral measurement composition; and stable language-neutral
@@ -25,6 +26,9 @@ applications that already have an RTD resistance measurement and need conversion
 modeling, calibration, tolerance, uncertainty, simulation, or cross-language
 validation tools.
 
+For the hardware-to-software acquisition layer that supplies resistance measurements to 
+`rtd-sensor`, we recommend the companion project [`rtd-acquire`](https://github.com/GregRR/rtd-acquire).
+
 ## Scope
 
 `rtd-sensor` currently provides these verified built-in characteristics:

learn/index.md

@@ -1,6 +1,6 @@
 ---
-title: Learn rtd-sensor
-description: Learn and use rtd-sensor, from quick Python setup and complete documentation through beginner-friendly RTD experiments, calibration, uncertainty, and embedded interoperability.
+title: rtd-sensor documentation — RTD conversion and modeling
+description: Learn rtd-sensor for Python RTD conversion and modeling, with Pt100/Pt1000 guides, calibration, uncertainty, and embedded interoperability.
 ---
 
 # Learn rtd-sensor
@@ -19,6 +19,13 @@ acquisition software must pass that resistance to `rtd-sensor`. `rtd-sensor` han
 RTD science and calculations; it does not handle wiring, SPI/I²C communication, ADCs, or
 other sensor-interface hardware.
 
+That separation is a benefit: acquisition software such as
+[`rtd-acquire`](https://gregrr.github.io/rtd-acquire/) can handle the hardware and 
+produce a reliable resistance measurement, while `rtd-sensor` focuses only on
+interpreting that resistance. Keeping those jobs separate makes it easier to change
+hardware, reuse the same RTD calculations in different systems, test each layer
+independently, and keep hardware faults distinct from RTD model or calculation errors.
+
 ## Let's Go!
 
 Ready to dive in and use `rtd-sensor` in research, engineering, or in a