diff --git a/src/labtoolkit/AudioAnalyser/RaSCMU200Audio.py b/src/labtoolkit/AudioAnalyser/RaSCMU200Audio.py
index 5a56048..4aed716 100644
--- a/src/labtoolkit/AudioAnalyser/RaSCMU200Audio.py
+++ b/src/labtoolkit/AudioAnalyser/RaSCMU200Audio.py
@@ -1,14 +1,14 @@
 import numpy as np
 from dataclasses import dataclass
 
-from ..IEEE488 import IEEE488
+from ..Instrument import Instrument
 from ..SCPI import SCPI
 
 
 class RaSCMU200Audio(Instrument, SCPI):
     """."""
     def __post__(self):
-        # if seconday
+        # if secondary
         self.write('INITiate:AFANalyzer:PRIMary')
 
         self.write('INITiate:AFGenerator:PRIMary')
diff --git a/src/labtoolkit/Enviromental/hydrotherm.py b/src/labtoolkit/Enviromental/hydrotherm.py
index 0aed8b3..7a9916e 100644
--- a/src/labtoolkit/Enviromental/hydrotherm.py
+++ b/src/labtoolkit/Enviromental/hydrotherm.py
@@ -1,37 +1,55 @@
+from dataclasses import dataclass
 
-if read.startswith(b'\x02') == True:
-data = bytes.decode(read)
-#print(data)
-# sample = b'\x0201041102330410\r'
+from ..Instrument import Instrument
 
-# sample = b'\x0201041102040606\r'
-# 020.4 C
-Bit = {
-    'D15'  : data[0],
-    'D14'  : data[1],
-    'D13'  : data[2],
-    'D12'  : data[3],
-    'D11'  : data[4],
-    'D10'  : data[5],
-    'D9'   : data[6],
-    'D8'   : data[7],
-    'D7'   : data[8],
-    'D6'   : data[9],
-    'D5'   : data[10],
-    'D4'   : data[11],
-    'D3'   : data[12],
-    'D2'   : data[13],
-    'D1'   : data[14],
-    'D0'   : data[15],
-}
-Value = {
-    'Humidity'      : Bit['D4']+Bit['D3']+Bit['D2']+'.'+Bit['D1'],
-    #'Temperature'   : Bit['D5']+Bit['D6']+Bit['D7']+Bit['D8'],
-    'Temperature'   : Bit['D8']+Bit['D7']+Bit['D6']+'.'+Bit['D5'],
-    'Udp'           : Bit['D9'],
-    'Ldp'           : Bit['D10'],
-    'USym'          : Bit['D11']+Bit['D12'],
-    'LSym'          : Bit['D13'],
-    'CPolarity'     : Bit['D14'],
-}
 
+class TBC(Instrument):
+    """."""
+
+    @dataclass
+    class Results:
+        """Class for keeping results from HydroTherm meter."""
+        Temperature: float
+        Humidity: float
+
+    def Measurement(self):
+        read = Instrument.read()
+        if read.startswith(b'\x02') == True:
+            data = bytes.decode(read)
+            #print(data)
+            # sample = b'\x0201041102330410\r'
+
+            # sample = b'\x0201041102040606\r'
+            # 020.4 C
+            Bit = {
+                'D15'  : data[0],
+                'D14'  : data[1],
+                'D13'  : data[2],
+                'D12'  : data[3],
+                'D11'  : data[4],
+                'D10'  : data[5],
+                'D9'   : data[6],
+                'D8'   : data[7],
+                'D7'   : data[8],
+                'D6'   : data[9],
+                'D5'   : data[10],
+                'D4'   : data[11],
+                'D3'   : data[12],
+                'D2'   : data[13],
+                'D1'   : data[14],
+                'D0'   : data[15],
+            }
+            Value = {
+                'Humidity'      : Bit['D4']+Bit['D3']+Bit['D2']+'.'+Bit['D1'],
+                #'Temperature'   : Bit['D5']+Bit['D6']+Bit['D7']+Bit['D8'],
+                'Temperature'   : Bit['D8']+Bit['D7']+Bit['D6']+'.'+Bit['D5'],
+                'Udp'           : Bit['D9'],
+                'Ldp'           : Bit['D10'],
+                'USym'          : Bit['D11']+Bit['D12'],
+                'LSym'          : Bit['D13'],
+                'CPolarity'     : Bit['D14'],
+            }
+            return self.Results(
+                Temperature=Value['Temperature'],
+                Humidity=Value['Humidity'],
+            )
diff --git a/src/labtoolkit/FieldStrength/Narda601.py b/src/labtoolkit/FieldStrength/Narda601.py
index 4803a69..75e1360 100644
--- a/src/labtoolkit/FieldStrength/Narda601.py
+++ b/src/labtoolkit/FieldStrength/Narda601.py
@@ -7,17 +7,15 @@
 import serial
 from serial.tools import list_ports
 
+from ..Instrument import Instrument
 
-class Narda601(FieldStrength):
+
+class Narda601(Instrument):
     """Narda601.
 
     .. figure::  images/FieldStrength/Narda601.jpg
     """
 
-    def __init__(self, instrument):
-        """."""
-        super().__init__(instrument)
-
     def setup(self):
         """Send setup commands to probe."""
         pass
@@ -41,11 +39,11 @@ def returnstr(self, binary=b'T\x00\x00\x00\x00'):
         return binary[1:].decode()  # Remove leading character from binary and decode
 
 
-    def decode_example(self):
+    def decode_example(self, hexes):
         for hexstring in hexes:
             hexstring = hexstring.replace(' ', '')  # Remove spaces in hexstring
             bins = binascii.unhexlify(hexstring)  # encode to binary, as you would receive over serial
-            print('{}\t::\t{}\t::\t{}'.format(hexstring, binarytoVm(bins), bins))  # print(Hex, Value, Binary)
+            print('{}\t::\t{}\t::\t{}'.format(hexstring, self.binarytoVm(bins), bins))  # print(Hex, Value, Binary)
 
 
     def query(self, ser, command):
diff --git a/src/labtoolkit/Formatter/plot.py b/src/labtoolkit/Formatter/plot.py
index 70b98c5..24c382f 100644
--- a/src/labtoolkit/Formatter/plot.py
+++ b/src/labtoolkit/Formatter/plot.py
@@ -1,5 +1,7 @@
 import matplotlib.pyplot as plt
 from matplotlib.ticker import EngFormatter
+import numpy as np
+
 
 def plot_add_minor_min_max_labels(ax):
     lo = np.inf
diff --git a/src/labtoolkit/Formula/Units.py b/src/labtoolkit/Formula/Units.py
index 7adfc11..f7d12a1 100644
--- a/src/labtoolkit/Formula/Units.py
+++ b/src/labtoolkit/Formula/Units.py
@@ -360,7 +360,7 @@ def dBuV_m(V_m):
 
     @classmethod
     def W_m2(V_m):
-        return (V/m**2) / 377
+        return (V_m**2) / 377
 
 class W_m2To:
 
diff --git a/src/labtoolkit/PowerAnalyser/VoltechPM100.py b/src/labtoolkit/PowerAnalyser/VoltechPM100.py
index 58fccdd..011f7fc 100644
--- a/src/labtoolkit/PowerAnalyser/VoltechPM100.py
+++ b/src/labtoolkit/PowerAnalyser/VoltechPM100.py
@@ -4,7 +4,7 @@
 class VoltechPM1000P(IEEE488):
 
     # inst = rm.open_resource('GPIB1::13::INSTR', read_termination='\n', write_termination='\n')  # , , **kwargs)
-    def get(self):
-        Hz = float(inst.query(':FNC:FRQ?'))
-        V = float(inst.query(':FNC:VLT?'))
-        return v, Hz
+    def Measurement(self):
+        Hz = float(self.query(':FNC:FRQ?'))
+        V = float(self.query(':FNC:VLT?'))
+        return V, Hz