Gw instek gdm 8261 desktop multimeter gw instek gdm 8261a p this gdm 8261 desktop multimeter from gw instek is a high precision 6 frac12 digit multimeter equipped with a host of outstanding features including the dual measurement displays while the 11 measurement functions and 10 math functions at high accuracy 35ppm dc voltage accuracy accommodate the most frequently performed parameter measurements in various application fields today p p manufactured with a scanner card carrying