There are three services covered under your definition
SCIENTIFIC OR TECHNICAL CONSULTANCY SERVICES 65(105)(za)
TECHNICAL TESTING AND ANALYSIS SERVICES 65(105)(zzh)
TECHNICAL INSPECTION AND CERTIFICATION SERVICES 65(105)(zzi)
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out of the above services if the service is catagorized in schedule 2 of export of services rule 2006, then only non taxable
the abstract of schedule 2 is here
(ii) specified in sub-clauses (a), (f), (h), (i), (j), (l), [* * *], (n), (o), [* * *], (w), (x), (y), (z), (zb), (zc), (zi), (zj), (zn), (zo), (zq),
(zr), (zt), (zu), (zv),(zw), (zza), (zzc), (zzd), (zzf), (zzg), (zzh), (zzi), (zzl), (zzm), (zzn), (zzo), (zzp), (zzs), (zzt), (zzv),
(zzw), (zzx), (zzy), (zzzd), (zzze), (zzzf), (zzzp), (zzzzg), (zzzzh), (zzzzi), (zzzzk) and (zzzzl) of clause (105) of
section 65 of the Act, be provision of such services as are performed outside India:
https://www.servicetax.gov.in/st_export_of_services_%20rules.pdf