diff --git a/src/domain_converters/frame_to_rt.rs b/src/domain_converters/frame_to_rt.rs
index 5c83388..eb7d1d1 100644
--- a/src/domain_converters/frame_to_rt.rs
+++ b/src/domain_converters/frame_to_rt.rs
@@ -1,5 +1,5 @@
 /// A converter from Frame -> retention time.
-#[derive(Debug, Clone)]
+#[derive(Debug, Default, Clone, PartialEq)]
 pub struct Frame2RtConverter {
     rt_values: Vec<f64>,
 }
diff --git a/src/domain_converters/scan_to_im.rs b/src/domain_converters/scan_to_im.rs
index 68339f4..e7390ff 100644
--- a/src/domain_converters/scan_to_im.rs
+++ b/src/domain_converters/scan_to_im.rs
@@ -1,5 +1,5 @@
 /// A converter from Scan -> (inversed) ion mobility.
-#[derive(Debug, Clone)]
+#[derive(Debug, Default, Clone, Copy, PartialEq)]
 pub struct Scan2ImConverter {
     scan_intercept: f64,
     scan_slope: f64,
diff --git a/src/domain_converters/tof_to_mz.rs b/src/domain_converters/tof_to_mz.rs
index e23ac18..c9a3abc 100644
--- a/src/domain_converters/tof_to_mz.rs
+++ b/src/domain_converters/tof_to_mz.rs
@@ -1,7 +1,7 @@
 use linreg::linear_regression;
 
 /// A converter from TOF -> m/z.
-#[derive(Debug, Clone)]
+#[derive(Debug, Default, Clone, Copy, PartialEq)]
 pub struct Tof2MzConverter {
     tof_intercept: f64,
     tof_slope: f64,
@@ -22,7 +22,7 @@ impl Tof2MzConverter {
         }
     }
 
-    pub fn from_pairs(data: &Vec<(f64, u32)>) -> Self {
+    pub fn regress_from_pairs(data: &Vec<(f64, u32)>) -> Self {
         let x: Vec<u32> = data.iter().map(|(_, x_val)| *x_val).collect();
         let y: Vec<f64> =
             data.iter().map(|(y_val, _)| (*y_val).sqrt()).collect();
diff --git a/src/io/readers/spectrum_reader/tdf.rs b/src/io/readers/spectrum_reader/tdf.rs
index fe1cbcc..58ffcd6 100644
--- a/src/io/readers/spectrum_reader/tdf.rs
+++ b/src/io/readers/spectrum_reader/tdf.rs
@@ -98,7 +98,7 @@ impl SpectrumReaderTrait for TDFSpectrumReader {
                 acc
             });
         if hits.len() >= 2 {
-            self.mz_reader = Tof2MzConverter::from_pairs(&hits);
+            self.mz_reader = Tof2MzConverter::regress_from_pairs(&hits);
         }
     }
 }