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  <xsd:element abstract="true" id="intt_statement-statement-note-10-stockbased-compensation-stock-option-activity-details-parentheticals" name="statement-statement-note-10-stockbased-compensation-stock-option-activity-details-parentheticals" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-10-stockbased-compensation-stock-options-valuation-assumptions-details" name="statement-statement-note-10-stockbased-compensation-stock-options-valuation-assumptions-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-10-stockbased-compensation-tables" name="statement-statement-note-10-stockbased-compensation-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-12-segment-information-identifiable-assets-details" name="statement-statement-note-12-segment-information-identifiable-assets-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-12-segment-information-longlived-assets-by-geographical-area-details" name="statement-statement-note-12-segment-information-longlived-assets-by-geographical-area-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-12-segment-information-net-revenue-from-unaffiliated-customers-details" name="statement-statement-note-12-segment-information-net-revenue-from-unaffiliated-customers-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-12-segment-information-segment-information-details" name="statement-statement-note-12-segment-information-segment-information-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-12-segment-information-tables" name="statement-statement-note-12-segment-information-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-2-summary-of-significant-accounting-policies-tables" name="statement-statement-note-2-summary-of-significant-accounting-policies-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-2-summary-of-significant-accounting-policies-weighted-average-common-shares-details" name="statement-statement-note-2-summary-of-significant-accounting-policies-weighted-average-common-shares-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-3-acquisition-intangible-assets-acquired-details" name="statement-statement-note-3-acquisition-intangible-assets-acquired-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-3-acquisition-proforma-information-details" name="statement-statement-note-3-acquisition-proforma-information-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-3-acquisition-purchase-price-details" name="statement-statement-note-3-acquisition-purchase-price-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-3-acquisition-tables" name="statement-statement-note-3-acquisition-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-4-fair-value-measurements-change-in-fair-value-of-contingent-consideration-liability-details" name="statement-statement-note-4-fair-value-measurements-change-in-fair-value-of-contingent-consideration-liability-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-4-fair-value-measurements-liabilities-measured-on-a-recurring-basis-details" name="statement-statement-note-4-fair-value-measurements-liabilities-measured-on-a-recurring-basis-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-4-fair-value-measurements-tables" name="statement-statement-note-4-fair-value-measurements-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-5-goodwill-and-intangible-assets-changes-in-the-amount-of-the-carrying-value-of-intangible-assets-details" name="statement-statement-note-5-goodwill-and-intangible-assets-changes-in-the-amount-of-the-carrying-value-of-intangible-assets-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-5-goodwill-and-intangible-assets-future-amortization-expense-details" name="statement-statement-note-5-goodwill-and-intangible-assets-future-amortization-expense-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-5-goodwill-and-intangible-assets-intangible-assets-details" name="statement-statement-note-5-goodwill-and-intangible-assets-intangible-assets-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-5-goodwill-and-intangible-assets-tables" name="statement-statement-note-5-goodwill-and-intangible-assets-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-6-revenue-from-contracts-with-customers-changes-in-allowance-for-doubtful-accounts-details" name="statement-statement-note-6-revenue-from-contracts-with-customers-changes-in-allowance-for-doubtful-accounts-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-6-revenue-from-contracts-with-customers-disaggregation-of-revenues-details" name="statement-statement-note-6-revenue-from-contracts-with-customers-disaggregation-of-revenues-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-6-revenue-from-contracts-with-customers-tables" name="statement-statement-note-6-revenue-from-contracts-with-customers-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-8-inventories-inventories-held-details" name="statement-statement-note-8-inventories-inventories-held-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-8-inventories-tables" name="statement-statement-note-8-inventories-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-9-debt-outstanding-letters-of-credit-details" name="statement-statement-note-9-debt-outstanding-letters-of-credit-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-note-9-debt-tables" name="statement-statement-note-9-debt-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="intt_statement-statement-significant-accounting-policies-policies" name="statement-statement-significant-accounting-policies-policies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
</xsd:schema>
