diff --git a/src/wavemeter.rs b/src/wavemeter.rs
index f1382f1..2798b48 100644
--- a/src/wavemeter.rs
+++ b/src/wavemeter.rs
@@ -75,7 +75,8 @@ fn do_calibrate(config: &Config) {
 
         sample_count += 1;
         if sample_count == max_sample_count {
-            println!("{}", ((position_max-position_min) as f64)/(noptica::Dpll::TURN as f64)*config.ref_wavelength);
+            let displacement = ((position_max-position_min) as f64)/(noptica::Dpll::TURN as f64)*config.ref_wavelength;
+            println!("{} um", 1.0e6*displacement);
             sample_count = 0;
             position_min = i64::max_value();
             position_max = i64::min_value();