Generator Set (Army). Instructions for operating the generator are contained in the applicable generator set
manual (TM 5-6115-465-12 for NSN 6115-00-118-1240).
Color Comparator Test Kit. Instructions to determine the pH values and chlorine residual in water are
contained in the color comparator test kit (para. 2-17, fig. 2-14). The Diethyl-P-Phenylene Diamine (DPD) tablets are not
part of the test kit, but are included in Storage Box No. 3.
TDS Meter (Portable). The TDS (total dissolved solids) meter is a calibrated meter that measures how much
electric current can flow through a sample of water. Pure water passes almost no current.
Description of the TDS meter:
Reads in ppm (parts per million) or in mg/l (milligrams per liter).
Has three scales: 0 to 5 x 10, 0 to 5 x 100, and 0 to 5 x 1000.
Change scales with the range switch.
Figure 2-80. Total Dissolved Solids (TDS) Meter
Always start with meter set on the 0 to 5 x 1000 scale. If you use a lower
scale first, you may damage the meter.
The TDS meter is factory calibrated and suitable for use when treating
fresh (lake, stream, pond, river) water. When treating seawater and
brackish water, it is necessary to recalibrate the meter. If your meter has
both "442" and NaCI" internal standards stamped on the bottom panel,
obtain a standard sodium chloride (NaCI) solution (Army -SC-4610-97-
CL-E16; MC SL-3-08580B) and refer to subpara. (3).
Recalibration instructions for meters with both internal standards (442 and NaCI) stamped on the bottom
of the meter: