<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31398252</termId><termName>hydrometers</termName><termType>PT</termType><termNote><![CDATA[ Instruments for measuring the density or specific gravity of liquids. ]]></termNote><termCreatedDate>2026-03-30 20:47:04</termCreatedDate><relation><relationType>UF</relationType><termId>31398253</termId><termName>hydrometer</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31358256</termId><termName>densimeters</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31444176</termId><termName>ammoniameters</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31444182</termId><termName>argentometers</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31444255</termId><termName>litrameters</termName><termType>PT</termType></relation></term>  </Zthes>