diff --git a/include/xo/unit/scaled_unit.hpp b/include/xo/unit/scaled_unit.hpp
index 88bc9416..f9cc8245 100644
--- a/include/xo/unit/scaled_unit.hpp
+++ b/include/xo/unit/scaled_unit.hpp
@@ -46,6 +46,8 @@ namespace xo {
         }
 
         namespace su {
+            /* note: probably retire these */
+
             constexpr auto nanogram = detail::make_unit_rescale_result<std::int64_t>(nu::nanogram);
             constexpr auto microgram = detail::make_unit_rescale_result<std::int64_t>(nu::microgram);
         }
diff --git a/utest/scaled_unit.test.cpp b/utest/scaled_unit.test.cpp
index 2df16c4f..d9b1d3d6 100644
--- a/utest/scaled_unit.test.cpp
+++ b/utest/scaled_unit.test.cpp
@@ -69,6 +69,37 @@ namespace xo {
                 static_assert(prod_rr.outer_scale_sq_ == 1.0);
             }
         } /*TEST_CASE(su_product)*/
+
+        TEST_CASE("scaled_unit0", "[scaled_unit0]") {
+            constexpr bool c_debug_flag = false;
+
+            scope log(XO_DEBUG2(c_debug_flag, "TEST_CASE.scaled_unit0"));
+
+            constexpr auto ng = su::nanogram;
+            constexpr auto ng2 = ng * ng;
+
+            log && log(xtag("ng", ng));
+            log && log(xtag("ng*ng", ng2));
+
+            static_assert(ng.natural_unit_.n_bpu() == 1);
+            static_assert(ng2.natural_unit_.n_bpu() == 1);
+        } /*TEST_CASE(scaled_unit0)*/
+
+        TEST_CASE("scaled_unit1", "[scaled_unit1]") {
+            constexpr bool c_debug_flag = false;
+
+            scope log(XO_DEBUG2(c_debug_flag, "TEST_CASE.scaled_unit1"));
+
+            constexpr auto ng = su::nanogram;
+            constexpr auto ng2 = ng / ng;
+
+            log && log(xtag("ng", ng));
+            log && log(xtag("ng/ng", ng2));
+
+            static_assert(ng.natural_unit_.n_bpu() == 1);
+            static_assert(ng2.natural_unit_.n_bpu() == 0);
+        } /*TEST_CASE(scaled_unit1)*/
+
     } /*namespace qty*/
 } /*namespace xo*/
 
diff --git a/utest/unit.test.cpp b/utest/unit.test.cpp
index d9cb80f0..04ba99b2 100644
--- a/utest/unit.test.cpp
+++ b/utest/unit.test.cpp
@@ -86,52 +86,6 @@ namespace xo {
 
         } /*TEST_CASE(basis_unit2_store)*/
 
-        TEST_CASE("scaled_unit0", "[scaled_unit0]") {
-            constexpr bool c_debug_flag = true;
-
-            // can get bits from /dev/random by uncommenting the 2nd line below
-            //uint64_t seed = xxx;
-            //rng::Seed<xoshio256ss> seed;
-
-            //auto rng = xo::rng::xoshiro256ss(seed);
-
-            scope log(XO_DEBUG2(c_debug_flag, "TEST_CASE.scaled_unit0"));
-            //log && log("(A)", xtag("foo", foo));
-
-            constexpr auto ng = su::nanogram;
-            constexpr auto ng2 = ng * ng;
-
-            log && log(xtag("ng", ng));
-            log && log(xtag("ng*ng", ng2));
-            //log && log(xtag("ng/ng",
-
-            static_assert(ng.natural_unit_.n_bpu() == 1);
-            static_assert(ng2.natural_unit_.n_bpu() == 1);
-        } /*TEST_CASE(scaled_unit0)*/
-
-        TEST_CASE("scaled_unit1", "[scaled_unit1]") {
-            constexpr bool c_debug_flag = true;
-
-            // can get bits from /dev/random by uncommenting the 2nd line below
-            //uint64_t seed = xxx;
-            //rng::Seed<xoshio256ss> seed;
-
-            //auto rng = xo::rng::xoshiro256ss(seed);
-
-            scope log(XO_DEBUG2(c_debug_flag, "TEST_CASE.scaled_unit1"));
-            //log && log("(A)", xtag("foo", foo));
-
-            constexpr auto ng = su::nanogram;
-            constexpr auto ng2 = ng / ng;
-
-            log && log(xtag("ng", ng));
-            log && log(xtag("ng/ng", ng2));
-            //log && log(xtag("ng/ng",
-
-            static_assert(ng.natural_unit_.n_bpu() == 1);
-            static_assert(ng2.natural_unit_.n_bpu() == 0);
-        } /*TEST_CASE(scaled_unit1)*/
-
     } /*namespace ut*/
 } /*namespace xo*/