End of arrow tip

Question

In this MWE the arrow "tip" i. e. the lower little blue line of the arrow is not at the same level as the dashed black line. How can I get it on the same line? Has it to do with baseline?(I looked for other cases e. g. https://tex.stackexchange.com/questions/46853/tikz-large-arrow-tips-at-the-end-of-smooth-curves but did not succeed.)

\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
  \draw[|-|, blue] (1,4)--(1,3)node[midway,right]{$h_1$};
  \draw[black, densely dashed] (0.5,3)--(1.2,3);
\end{tikzpicture}
\end{document}

Answer 1

End of arrow head is at given coordinate. In your case this mens. zhan the bottom bar border is at given coordinate. If I understand you correctly, you like to have, that at given coordinate is verical center of bar. This means, that you need to prolong line for 0.5\pgfplineswidth:

\documentclass[border=3.141592]{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
  \draw[|-|, 
        shorten >=-0.5\pgflinewidth,  % <--- added 
        blue!50] (1,4)-- node[right]{$h_1$} (1,3) ;
  \draw[densely dashed, very thin] (0.5,3)--(1.2,3);
\end{tikzpicture}
\end{document}