WM B Johnson GSM-115, 4 Range Survey Meter WM B Johnson GSM-115, 4 Range Survey Meter Print WM B Johnson GSM-115, 4 Ranges Survey Meter Visual “low battery” and saturation detection indicators. Adjustable high voltage 300 – 1300 vdc ±1%. Input sensitivity 0.050 v p-p. Linearity ± 10% of true value. Time response adjustable to 4 –20 seconds – 90% of full scale. Audio output – water and solvent proof. Uses two 9 Volt alkaline batteries. 5” rugged waterproof panel meter. 5½” (14 cm) H X 3” (7.5 cm) W X 7” (18 cm). 25 lb (1 kg). Compatible with numerous probes. Call us for the specific probe for your needs. QSM1306 Survey meter, 4 ranges – GSM-115 Request for information