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You'll be able to determine levels for 16 different water parameters and included are instructions and a handy booklet of reference values for different biotypes and specific fish species (excerpt from Fish Vetting Essentials).
Items may be purchased individually by request. RRP for individual items: ammonia/ammonium ($35), nitrite ($35), nitrate ($35), pH ($25), KH ($25), GH ($25), oxygen ($45), carbon dioxide chart ($-), phosphate ($35), calcium ($45), magnesium ($60), copper ($45), iron ($35), salinity refractometer ($105), measuring tape for volume ($8.50), infrared thermometer ($58), carry case ($17), booklet ($20).
NB: Individual items may vary depending on availability.