The test tip is inserted into the measuring slot and an external force of 1 lb is applied to make the indicator light, and the cusp is determined to be a sharp cusp.
Ichopho test ufakwa slot wokulinganisa amandla sangaphandle 1 lb sisetshenziswa ukwenza ukukhanya inkomba, futhi cusp kunqunywa ukuba cusp abukhali.