Eseway Hardness Testers Types R, PR, PRB, ER, ELR, ERW, ELRW, ERBW and ELRBW Operation Manual Eseway Hardness Testers Models: Types R, PR, PRB, ER, ELR, ERW, ELRW, ERBW and ELRBW. Operating Instructions with Hardness Scales and Brinell Conversion Charts. Manufacturers: Eseway Models: R PR PRB ER ELR ERW ELRW ERBW ELRBW Contents: Operators Manual