+extern int get_pressure_units(unsigned int mb, const char **units);
+extern double get_depth_units(unsigned int mm, int *frac, const char **units);
+extern double get_volume_units(unsigned int mm, int *frac, const char **units);
+extern double get_temp_units(unsigned int mm, const char **units);
+
+static inline double ml_to_cuft(int ml)
+{
+ return ml / 28316.8466;
+}
+
+static inline double cuft_to_l(double cuft)
+{
+ return cuft * 28.3168466;
+}
+