This UN number is no longer assigned to a packing group in Table 3-1 of the ICAO TI as from 1 January 2019. According to special provision A44, for the purposes of describing the dangerous goods in the Shippers Declaration the packing group indicated in the transportation document shall correspond to the strictest packing group assigned to one of the substances contained in the chemical test kit. If the chemical test kit contains only dangerous goods to which no packing group is assigned, a packing group does not need be indicated in the transportation document.
Therefore, no packing group has to be specified for this chemical test kit.